Use built-in github annotation output for stylelint (#30165)

.github/stylelint-matcher.json

@@ -1,21 +0,0 @@
-{
-  "problemMatcher": [
-    {
-      "owner": "stylelint",
-      "pattern": [
-        {
-          "regexp": "^([^\\s].*)$",
-          "file": 1
-        },
-        {
-          "regexp": "^\\s+((\\d+):(\\d+))?\\s+(✖|×)\\s+(.*)\\s{2,}(.*)$",
-          "line": 2,
-          "column": 3,
-          "message": 5,
-          "code": 6,
-          "loop": true
-        }
-      ]
-    }
-  ]
-}

.github/workflows/lint-css.yml

@@ -38,9 +38,5 @@ jobs:
       - name: Set up Javascript environment
         uses: ./.github/actions/setup-javascript
 
-      - uses: xt0rted/stylelint-problem-matcher@v1
-
-      - run: echo "::add-matcher::.github/stylelint-matcher.json"
-
       - name: Stylelint
-        run: yarn lint:css
+        run: yarn lint:css -f github