Revert "Skip running gradle checks on release notes (opensearch-project#13477)" (opensearch-project#13499)

This reverts commit 1765e20.

Author: peternied

.github/workflows/gradle-check.yml

@@ -7,10 +7,6 @@ on:
       - 'dependabot/**'
   pull_request_target:
     types: [opened, synchronize, reopened]
-    paths-ignore:
-      - 'release-notes/**'
-      - '.github/**'
-      - '**.md'
 
 permissions:
   contents: read # to fetch code (actions/checkout)