Add workflow to rebase release branches (#6968)

* Adds a workflow that rebases release_4.6 onto release_4.6-next

.github/workflows/feature_branch_sync.yml

@@ -0,0 +1,48 @@
+name: Rebase release_4.6 into release_4.6-next
+
+on:
+  push:
+    branches:
+      - release_4.6
+  workflow_dispatch:
+    # Allows manual triggering of the workflow from the GitHub UI
+
+jobs:
+  rebase:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout release_4.6-next Branch
+        uses: actions/checkout@v4
+        with:
+          ref: release_4.6-next
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Fetch release_4.6 Branch
+        run: git fetch origin release_4.6:release_4.6
+
+      - name: Attempt Rebase
+        id: rebase_attempt # Give this step an something to reference its outcome
+        run: |
+          git checkout release_4.6-next
+          # Attempt the rebase.
+          # The '|| true' allows the script to continue even if rebase fails,
+          # so we can check the status and then abort.
+          git rebase release_4.6 || true
+        continue-on-error: true # Allow this step to fail without stopping the workflow immediately
+
+      - name: Check for Conflicts and Abort if Necessary
+        run: |
+          # Check if there are any unmerged paths (i.e., conflicts)
+          if git status --porcelain | grep "^UU"; then
+            echo "::error::Rebase failed due to merge conflicts. Aborting rebase."
+            git rebase --abort
+            exit 1 # Fail the job explicitly
+          else
+            echo "Rebase completed without conflicts."
+          fi
+
+      - name: Force Push Rebased release_4.6-next Branch
+        # Only run this step if the previous steps succeeded (no conflicts)
+        if: success() && steps.rebase_attempt.outcome != 'failure'
+        run: |
+          git push --force origin release_4.6-next