PHPLIB-739, PHPLIB-745: Update aggregate-write-readPreference tests

Skips $out tests for serverless environments and bumps minServerVersion to 4.2 for tests expecting a readConcern to be passed alongside a write stage.

Synced with mongodb/specifications@dce2c48

Author: jmikola

Diff for: tests/UnifiedSpecTests/crud/aggregate-write-readPreference.json

@@ -1,6 +1,6 @@
 {
   "description": "aggregate-write-readPreference",
-  "schemaVersion": "1.3",
+  "schemaVersion": "1.4",
   "runOnRequirements": [
     {
       "minServerVersion": "3.6",
@@ -90,7 +90,8 @@
       "description": "Aggregate with $out includes read preference for 5.0+ server",
       "runOnRequirements": [
         {
-          "minServerVersion": "5.0"
+          "minServerVersion": "5.0",
+          "serverless": "forbid"
         }
       ],
       "operations": [
@@ -180,7 +181,9 @@
       "description": "Aggregate with $out omits read preference for pre-5.0 server",
       "runOnRequirements": [
         {
-          "maxServerVersion": "4.4.99"
+          "minServerVersion": "4.2",
+          "maxServerVersion": "4.4.99",
+          "serverless": "forbid"
         }
       ],
       "operations": [

Diff for: tests/UnifiedSpecTests/crud/db-aggregate-write-readPreference.json

@@ -64,7 +64,8 @@
       "description": "Database-level aggregate with $out includes read preference for 5.0+ server",
       "runOnRequirements": [
         {
-          "minServerVersion": "5.0"
+          "minServerVersion": "5.0",
+          "serverless": "forbid"
         }
       ],
       "operations": [
@@ -157,7 +158,9 @@
       "description": "Database-level aggregate with $out omits read preference for pre-5.0 server",
       "runOnRequirements": [
         {
-          "maxServerVersion": "4.4.99"
+          "minServerVersion": "4.2",
+          "maxServerVersion": "4.4.99",
+          "serverless": "forbid"
         }
       ],
       "operations": [