Enable flow to release/8.0-staging and release/9.0-staging (#34933)

Update CODEOWNERS

Author: AndriySvyryd

Diff for: .github/CODEOWNERS

@@ -3,7 +3,10 @@
 
 /azure-pipelines.yml                    @AndriySvyryd @maumar
 /azure-pipelines-public.yml             @AndriySvyryd @maumar
+/github-merge-flow.jsonc                @AndriySvyryd @maumar
+/global.json                            @AndriySvyryd @maumar
+/NuGet.config                           @AndriySvyryd @maumar
+/.config/                               @AndriySvyryd
+/.github/                               @dotnet/efteam
 /eng/                                   @AndriySvyryd @maumar
-/eng/common/                            @dotnet-maestro-bot @AndriySvyryd @maumar
-/eng/Versions.props                     @dotnet-maestro-bot @AndriySvyryd @maumar
-/eng/Version.Details.xml                @dotnet-maestro-bot @AndriySvyryd @maumar
+/src/                                   @dotnet/efteam

Diff for: github-merge-flow.jsonc

@@ -1,19 +1,19 @@
 // IMPORTANT: This file is read by the merge flow from main branch only. 
 {
     "merge-flow-configurations": {
-        // Automate opening PRs to merge release/8.0 to release/9.0
+        // Automate opening PRs to merge release/8.0 branch into release/8.0-staging
         "release/8.0":{
-            "MergeToBranch": "release/9.0",
+            "MergeToBranch": "release/8.0-staging",
             "ExtraSwitches": "-QuietComments"
         },
-        // Automate opening PRs to merge release/9.0-rc1 to release/9.0
-        "release/9.0-rc1":{
+        // Automate opening PRs to merge release/8.0 to release/9.0
+        "release/8.0":{
             "MergeToBranch": "release/9.0",
             "ExtraSwitches": "-QuietComments"
         },
-        // Automate opening PRs to merge release/9.0-rc2 to release/9.0
-        "release/9.0-rc2":{
-            "MergeToBranch": "release/9.0",
+        // Automate opening PRs to merge release/9.0 branch into release/9.0-staging
+        "release/9.0":{
+            "MergeToBranch": "release/9.0-staging",
             "ExtraSwitches": "-QuietComments"
         },
         // Automate opening PRs to merge release/9.0 to main