Revert "[Action] master 변경사항 backend에 적용"

frontend/.github/workflows/change-pr-target.yaml

@@ -1,28 +0,0 @@
-name: Change PR target if base branch is master
-
-on:
-  pull_request:
-    types:
-      - opened
-      - synchronize
-      - reopened
-    branches:
-      - master
-
-jobs:
-  change-pr-target:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set target environment variable
-        run: |
-          if [[ "${GITHUB_HEAD_REF}" == fe* || "${GITHUB_HEAD_REF}" == FE* ]]; then
-            echo "target=frontend" >> $GITHUB_ENV
-          elif [[ "${GITHUB_HEAD_REF}" == be* || "${GITHUB_HEAD_REF}" == BE* ]]; then
-            echo "target=backend" >> $GITHUB_ENV
-          fi
-
-      - name: Change base branch for PR
-        if: env.target == 'frontend' || env.target == 'backend'
-        run: gh pr edit ${{ github.event.pull_request.number }} --base ${{ env.target }} --repo ${{ github.repository }}
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}