Enable automated inter-branch merges for 10.0 (#63277)

Author: wtgodbe

github-merge-flow.jsonc

@@ -1,5 +1,20 @@
 // IMPORTANT: This file is read by the merge flow from main branch only. 
 {
     "merge-flow-configurations": {
+        // Automate opening PRs to merge release/10.0 to main
+        "release/10.0":{
+            "MergeToBranch": "main",
+            "ExtraSwitches": "-QuietComments"
+        },
+        // Automate opening PRs to merge release/10.0-rc1 to release/10.0
+        "release/10.0-rc1":{
+            "MergeToBranch": "release/10.0",
+            "ExtraSwitches": "-QuietComments"
+        },
+        // Automate opening PRs to merge release/10.0-rc2 to release/10.0
+        "release/10.0-rc2":{
+            "MergeToBranch": "release/10.0",
+            "ExtraSwitches": "-QuietComments"
+        }
     }
 }