[No QA] Replace contributorValidationGate with isAuthorizedContributor action

.github/actions/javascript/isAuthorizedContributor/action.yml

@@ -0,0 +1,25 @@
+name: 'Is Authorized Contributor'
+description: 'Checks whether a PR author is authorized to contribute (org member, Contributor+, or linked issue/PR)'
+inputs:
+    PR_NUMBER:
+        description: Pull request number
+        required: true
+    PR_AUTHOR:
+        description: Pull request author login
+        required: true
+    AUTHOR_ASSOCIATION:
+        description: "Author's association with the repository (MEMBER, OWNER, CONTRIBUTOR, etc.)"
+        required: true
+    GITHUB_TOKEN:
+        description: Auth token for repository API calls
+        required: false
+        default: ${{ github.token }}
+    OS_BOTIFY_TOKEN:
+        description: OSBotify token for org team membership (read:org)
+        required: true
+outputs:
+    IS_AUTHORIZED:
+        description: "'true' if the contributor is authorized, 'false' otherwise"
+runs:
+    using: 'node24'
+    main: './index.js'