Fix Gradle: isolate fix

See PR comment: #3794 (comment)

I attempted the above proposed next steps in this branch and ran the pipeline manually, it and one of the changes fixed the issue!

I'm now going to figure out which specific change fixed the Gradle version issue, and I'll put up a new PR.

The first isolated change will be `workflows/secrel.yml#gate-check:# runs-on: ubuntu-20.04`

.github/actions/setup-vro/action.yml

@@ -25,7 +25,7 @@ runs:
         # To avoid a growing cache over time, attempt to delete any files in the Gradle User Home
         # that were not used by Gradle during the workflow, prior to saving the cache.
         # https://github.com/gradle/actions/setup-gradle@v3#removing-unused-files-from-gradle-user-home-before-saving-to-cache
-        gradle-home-cache-cleanup: false
+        gradle-home-cache-cleanup: true
 
     - uses: ./.github/actions/install-java-tools
 
@@ -55,8 +55,3 @@ runs:
         python3 -m venv ${VENV_EP_MERGE}
         source ${VENV_EP_MERGE}/bin/activate
         pip install -r domain-ee/ee-ep-merge-app/src/requirements.txt
-
-    - name: "Clear Gradle Cache (Debug Step)"
-      shell: bash
-      run: rm -rf ~/.gradle || true
-      if: always()  # Ensure cache is cleared even on workflow failures