build: remove legacy clang-format workflow (#13887)

.github/workflows/clang-format.yml

@@ -1,28 +0,0 @@
-name: clang-format
-on: pull_request_target
-jobs:
-  clang-format:
-    permissions: write-all
-    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.fork
-    name: "Code Style"
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: clang-format check
-        uses: jidicula/clang-format-action@v4.16.0
-        with:
-          exclude-regex: ^subprojects$
-
-      - name: Create comment
-        if: ${{ failure() && github.event_name == 'pull_request' }}
-        run: |
-          echo 'Please fix the formatting issues by running [`clang-format`](https://wiki.hyprland.org/Contributing-and-Debugging/PR-Guidelines/#code-style).' > clang-format.patch
-
-      - name: Post comment
-        if: ${{ failure() && github.event_name == 'pull_request' }}
-        uses: mshick/add-pr-comment@v2
-        with:
-          message-path: |
-            clang-format.patch