docs-util: fix release scripts (#6353)

- Fix GitHub action to run on push and check if the commit message is "chore: Release". Only then are TSDocs generated and a PR is opened.
- Add an option to pass to the `run:release` method of the docblock generator a release tag. This is helpful in cases when the GitHub action fails for any reason.
- Add scripts that checks the message of a commit.

docs-util/packages/scripts/package.json

@@ -6,11 +6,13 @@
     "access": "public"
   },
   "scripts": {
+    "build": "tsc",
     "generate:announcement": "ts-node ./doc-change-release.ts",
     "generate:reference": "ts-node ./generate-reference.ts",
     "merge:references": "yarn generate:reference merge",
     "check:freshness": "ts-node ./freshness-check.ts",
-    "generate:message": "ts-node ./get-generate-diff-message.ts"
+    "generate:message": "ts-node ./get-generate-diff-message.ts",
+    "check:release-commit": "node ./dist/check-release-commit.js"
   },
   "version": "0.0.0",
   "type": "module",