Remove release-branch-sync update from create-release-branch workflow

The release-branch-sync workflow was specifically for keeping the olive
branch in sync with feature releases. Since we've removed the olive
trigger branch dependency, this update is no longer needed.

Only the force-bump-branches workflow update is retained as it's still
relevant for the new file-based repository approach.

Jira: OSPRH-25746

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Signed-off-by: Martin Schuppert <mschuppert@redhat.com>

Author: stuggi

.github/workflows/create-release-branch-v1.yml

@@ -704,11 +704,10 @@ jobs:
             exit 1
           fi
 
-          update_yaml_value ".github/workflows/release-branch-sync.yaml" ".on.workflow_call.inputs.source_branch.default" "${BRANCH_NAME}"
           update_yaml_value ".github/workflows/force-bump-branches.yaml" ".jobs.trigger-jobs.strategy.matrix.branch" "${FORCE_BUMP_BRANCHES}"
 
           # Commit and push changes if any were made
-          commit_and_push "ci: Update workflow defaults for ${BRANCH_NAME}" ".github/workflows/" "${SOURCE_BRANCH}"
+          commit_and_push "ci: Update force-bump-branches for ${BRANCH_NAME}" ".github/workflows/force-bump-branches.yaml" "${SOURCE_BRANCH}"
 
           cd .. && rm -rf "$TEMP_DIR"
           echo "Workflow finished."