ci: remove unused workflow

.github/workflows/linter.yml

@@ -1,31 +0,0 @@
-name: "[v3] Lint"
-
-on:
-  push:
-    branches:
-      - v3.x
-  pull_request:
-    branches:
-      - v3.x
-
-jobs:
-  lint:
-    name: Lint
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: technote-space/auto-cancel-redundant-workflow@v1
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: 0
-      - uses: github/super-linter@v3
-        env:
-          VALIDATE_ALL_CODEBASE: false
-          VALIDATE_JAVASCRIPT_STANDARD: false
-          VALIDATE_TYPESCRIPT_STANDARD: false
-          LINTER_RULES_PATH: .
-          JAVASCRIPT_ES_CONFIG_FILE: .eslintrc.json
-          JAVASCRIPT_DEFAULT_STYLE: prettier
-          DEFAULT_BRANCH: v3.x
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          FILTER_REGEX_INCLUDE: .*src/.*