Schema change to nested facet structure

Finder frontend and Government frontend view the nested facets as 2 separate facets. We make it easier by sending them as separate facets with a reference back to their main facet value.
Main facet label is also required to populate the subfacet label in the format `Main facet label - Sub Facet Label` for when JS is disabled.

The changes made in SP now make the use of `sub_facets` field obsolete, but the removal of that field will be done in a separate PR.

content_schemas/dist/formats/finder/frontend/schema.json

@@ -821,6 +821,14 @@
           "description": "A human readable label",
           "type": "string"
         },
+        "main_facet_label": {
+          "description": "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+          "type": "string"
+        },
+        "main_facet_value": {
+          "description": "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+          "type": "string"
+        },
         "value": {
           "description": "A value to use for form controls",
           "type": "string"
@@ -844,6 +852,14 @@
           "description": "A human readable label",
           "type": "string"
         },
+        "main_facet_label": {
+          "description": "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+          "type": "string"
+        },
+        "main_facet_value": {
+          "description": "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+          "type": "string"
+        },
         "sub_facets": {
           "description": "Possible values to show for non-dynamic select nested facets. All values are shown regardless of the search.",
           "type": "array",

content_schemas/dist/formats/finder/notification/schema.json

@@ -934,6 +934,14 @@
           "description": "A human readable label",
           "type": "string"
         },
+        "main_facet_label": {
+          "description": "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+          "type": "string"
+        },
+        "main_facet_value": {
+          "description": "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+          "type": "string"
+        },
         "value": {
           "description": "A value to use for form controls",
           "type": "string"
@@ -957,6 +965,14 @@
           "description": "A human readable label",
           "type": "string"
         },
+        "main_facet_label": {
+          "description": "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+          "type": "string"
+        },
+        "main_facet_value": {
+          "description": "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+          "type": "string"
+        },
         "sub_facets": {
           "description": "Possible values to show for non-dynamic select nested facets. All values are shown regardless of the search.",
           "type": "array",

content_schemas/dist/formats/finder/publisher_v2/schema.json

@@ -587,6 +587,14 @@
           "description": "A human readable label",
           "type": "string"
         },
+        "main_facet_label": {
+          "description": "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+          "type": "string"
+        },
+        "main_facet_value": {
+          "description": "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+          "type": "string"
+        },
         "value": {
           "description": "A value to use for form controls",
           "type": "string"
@@ -610,6 +618,14 @@
           "description": "A human readable label",
           "type": "string"
         },
+        "main_facet_label": {
+          "description": "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+          "type": "string"
+        },
+        "main_facet_value": {
+          "description": "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+          "type": "string"
+        },
         "sub_facets": {
           "description": "Possible values to show for non-dynamic select nested facets. All values are shown regardless of the search.",
           "type": "array",

content_schemas/formats/shared/definitions/label_value_pair.jsonnet

@@ -16,6 +16,14 @@
         description: "A value to use for form controls",
         type: "string",
       },
+      main_facet_label: {
+        description: "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+        type: "string",
+      },
+      main_facet_value: {
+        description: "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+        type: "string",
+      },
       default: {
         description: "The default option for a radio facet",
         type: "boolean"

content_schemas/formats/shared/definitions/label_value_pair_with_sub_facets.jsonnet

@@ -16,6 +16,14 @@
         description: "A value to use for form controls",
         type: "string",
       },
+      main_facet_label: {
+        description: "A label that refers to the main facet label of this facet if it is a sub facet. The label is used to generate sub facet labels on frontend apps.",
+        type: "string",
+      },
+      main_facet_value: {
+        description: "A value that refers to the main facet value of this facet if it is a sub facet. The value is used to group sub facets into sub category groupings for navigational purposes.",
+        type: "string",
+      },
       sub_facets: {
         description: "Possible values to show for non-dynamic select nested facets. All values are shown regardless of the search.",
         type: "array",