run only the release tests to speed up tests

Test were being run 3 times since it was running debug, release, and
unity targets.

Author: jkasten2

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
       - name: "[Test] SDK Unit Tests"
         working-directory: OneSignalSDK
         run: |
-          ./gradlew test --console=plain --continue
+          ./gradlew testReleaseUnitTest --console=plain --continue
       - name: Unit tests results
         if: failure()
         uses: actions/upload-artifact@v3