Add GHA for custom PR review (#10951)

* Add GHA for custom PR review

* Change FILES rule settings

* Update rules according to feedback

* Update .github/pr-custom-review.yml

Co-authored-by: Denis Pisarev <17856421+TriplEight@users.noreply.github.com>

* CI: PRCR new 🔒 team is locks-review

* CI: rename a confusing step

* Update .github/workflows/pr-custom-review.yml

Co-authored-by: João Paulo Silva de Souza <77391175+joao-paulo-parity@users.noreply.github.com>

* CI: use a proper new team for 

as per discussion with @drahnr it was decided to create a dedicated team for reviewing runtime files

* Update pr-custom-review.yml

* Update .github/workflows/pr-custom-review.yml

Co-authored-by: João Paulo Silva de Souza <77391175+joao-paulo-parity@users.noreply.github.com>

* Update .github/workflows/pr-custom-review.yml

Co-authored-by: João Paulo Silva de Souza <77391175+joao-paulo-parity@users.noreply.github.com>

Co-authored-by: Denis Pisarev <17856421+TriplEight@users.noreply.github.com>
Co-authored-by: TriplEight <denis@parity.io>
Co-authored-by: Denis Pisarev <denis.pisarev@parity.io>
Co-authored-by: João Paulo Silva de Souza <77391175+joao-paulo-parity@users.noreply.github.com>

substrate/.github/workflows/pr-custom-review.yml

@@ -0,0 +1,23 @@
+name: Check reviews
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - review_requested
+      - review_request_removed
+  pull_request_review:
+
+jobs:
+  pr-custom-review:
+    runs-on: ubuntu-latest
+    steps:
+      - name: pr-custom-review
+        uses: paritytech/pr-custom-review@v2
+        with:
+          token: ${{ secrets.PRCR_TOKEN }}