Remove unneeded haml-lint problem matcher (#37930)

.github/workflows/haml-lint-problem-matcher.json

@@ -1,17 +0,0 @@
-{
-  "problemMatcher": [
-    {
-      "owner": "haml-lint",
-      "severity": "warning",
-      "pattern": [
-        {
-          "regexp": "^(.*):(\\d+)\\s\\[W]\\s(.*):\\s(.*)$",
-          "file": 1,
-          "line": 2,
-          "code": 3,
-          "message": 4
-        }
-      ]
-    }
-  ]
-}

.github/workflows/lint-haml.yml

@@ -42,5 +42,4 @@ jobs:
 
       - name: Run haml-lint
         run: |
-          echo "::add-matcher::.github/workflows/haml-lint-problem-matcher.json"
           bin/haml-lint --reporter github