Fix lint-swagger action (#25593)

- Add detection for swagger changes and run `lint-swagger` on it
- Remove `lint-swagger` from `lint-frontend`
- Remove `lint-md` from `lint-frontend`

.github/workflows/files-changed.yml

@@ -15,6 +15,8 @@ on:
         value: ${{ jobs.detect.outputs.templates }}
       docker:
         value: ${{ jobs.detect.outputs.docker }}
+      swagger:
+        value: ${{ jobs.detect.outputs.swagger }}
 
 jobs:
   detect:
@@ -27,6 +29,7 @@ jobs:
       actions: ${{ steps.changes.outputs.actions }}
       templates: ${{ steps.changes.outputs.templates }}
       docker: ${{ steps.changes.outputs.docker }}
+      swagger: ${{ steps.changes.outputs.swagger }}
     steps:
       - uses: actions/checkout@v3
       - uses: dorny/paths-filter@v2
@@ -63,3 +66,6 @@ jobs:
               - "Dockerfile.rootless"
               - "docker/**"
               - "Makefile"
+
+            swagger:
+              - "templates/swagger/v1_json.tmpl"