use backport/ prefix for cherry-pick feature branches

Agent-Logs-Url: https://github.com/microsoft/react-native-windows/sessions/a8056eb8-9334-439b-824a-f47c401d37b4

Co-authored-by: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>

Author: Copilot

.github/workflows/backport-fix-null-deref-selectioncontainer.yml

@@ -50,7 +50,7 @@ jobs:
         run: |
           COMMIT_ID="2269a198b3d64ff4ed66d16222e4038178eef1cf"
           TARGET_BRANCH="${{ matrix.target_branch }}"
-          FEATURE_BRANCH="copilot/cherry-pick-2269a198b-to-${TARGET_BRANCH}"
+          FEATURE_BRANCH="backport/cherry-pick-2269a198b-to-${TARGET_BRANCH}"
 
           echo "🌿 Creating feature branch $FEATURE_BRANCH from $TARGET_BRANCH"
           git checkout -b "$FEATURE_BRANCH" "origin/$TARGET_BRANCH"

.github/workflows/cherry-pick-commit.yml

@@ -51,7 +51,7 @@ jobs:
           COMMIT_ID="${{ github.event.inputs.commit_id }}"
           TARGET_BRANCH="${{ github.event.inputs.target_branch }}"
           SHORT_ID="${COMMIT_ID:0:9}"
-          FEATURE_BRANCH="copilot/cherry-pick-${SHORT_ID}-to-${TARGET_BRANCH}"
+          FEATURE_BRANCH="backport/cherry-pick-${SHORT_ID}-to-${TARGET_BRANCH}"
 
           echo "🌿 Creating feature branch $FEATURE_BRANCH from $TARGET_BRANCH"
           git checkout -b "$FEATURE_BRANCH" "origin/$TARGET_BRANCH"