Clean up github actions (#24984)

- Merge the file filters into `files-changed.yml`
- Remove unused yaml anchors like `&backend`
- Merge the `compliance-docs` workflow into `compliance`
- Add actions linting
- Misc cleanups for whitespace and step names

.github/workflows/files-changed.yml

@@ -1,32 +1,53 @@
-name: files changed
+name: files-changed
 
 on:
   workflow_call:
     outputs:
-      docs:
-        description: "whether docs files changed"
-        value: ${{ jobs.files-changed.outputs.docs }}
       backend:
         description: "whether backend files changed"
-        value: ${{ jobs.files-changed.outputs.backend }}
+        value: ${{ jobs.detect.outputs.backend }}
       frontend:
         description: "whether frontend files changed"
-        value: ${{ jobs.files-changed.outputs.frontend }}
+        value: ${{ jobs.detect.outputs.frontend }}
+      docs:
+        description: "whether docs files changed"
+        value: ${{ jobs.detect.outputs.docs }}
+      actions:
+        description: "whether actions files changed"
+        value: ${{ jobs.detect.outputs.actions }}
 
 jobs:
-  files-changed:
+  detect:
     name: detect which files changed
     runs-on: ubuntu-latest
     timeout-minutes: 3
     # Map a step output to a job output
     outputs:
-      docs: ${{ steps.changes.outputs.docs }}
       backend: ${{ steps.changes.outputs.backend }}
       frontend: ${{ steps.changes.outputs.frontend }}
+      docs: ${{ steps.changes.outputs.docs }}
+      actions: ${{ steps.changes.outputs.actions }}
     steps:
       - uses: actions/checkout@v3
-      - name: Check for backend file changes
-        uses: dorny/paths-filter@v2
+      - uses: dorny/paths-filter@v2
         id: changes
         with:
-          filters: .github/file-filters.yml
+          filters: |
+            backend:
+              - "**/*.go"
+              - "**/*.tmpl"
+              - "go.mod"
+              - "go.sum"
+
+            frontend:
+              - "**/*.js"
+              - "web_src/**"
+              - "package.json"
+              - "package-lock.json"
+
+            docs:
+              - "**/*.md"
+              - "docs/**"
+
+            actions:
+              - ".github/workflows/*"