Chore: replace secretary with GHA (#9723)

.github/labeler.yml

@@ -0,0 +1,22 @@
+backend:
+  - changed-files:
+      - any-glob-to-any-file:
+          - 'src/**'
+          - 'pyproject.toml'
+          - 'uv.lock'
+          - 'requirements.txt'
+
+frontend:
+  - changed-files:
+      - any-glob-to-any-file:
+          - 'src-ui/**'
+
+documentation:
+  - changed-files:
+      - any-glob-to-any-file:
+          - 'docs/**'
+
+ci-cd:
+  - changed-files:
+      - any-glob-to-any-file:
+          - '.github/**'