Revert "Skip running gradle checks on release notes"

[peternied]

Description

Reverts opensearch-project/OpenSearch#13477

We are seeing changes that are stalled because gradle check which is required by branch protections isn't being triggered, see stuck PR [1]. While we get an updated solution [2] in place, reverting this change.

• [1] https://github.com/opensearch-project/OpenSearch/pull/13494
• [2] https://github.com/opensearch-project/OpenSearch/pull/13498

Check List

• [ ] ~New functionality includes testing.~
  • [ ] ~All tests pass~
• [ ] ~New functionality has been documented.~
  • [ ] ~New functionality has javadoc added~
• [X] Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• [x] Commits are signed per the DCO using --signoff
• [ ] ~Commit changes are listed out in CHANGELOG.md file (See: Changelog)~
• [ ] ~Public documentation issue/PR created~