[Backport 2.x] Remove the separate gradle install for bwc-tests (open…

…search-project#3642) (opensearch-project#3647)

### Description
Backport 3fbeec6 from opensearch-project#3642.

### Check List
- [ ] ~New functionality includes testing~
- [ ] ~New functionality has been documented~
- [X] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and
signing off your commits, please check
[here](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).

Signed-off-by: Peter Nied <[email protected]>

.github/actions/run-bwc-suite/action.yaml

@@ -41,14 +41,14 @@ runs:
       with:
         cache-disabled: true
         arguments: |
+          -p bwc-test
           bwcTestSuite
           -Dtests.security.manager=false
           -Dtests.opensearch.secure=true
           -Dtests.opensearch.username=${{ inputs.username }}
           -Dtests.opensearch.password=${{ inputs.password }}
           -Dbwc.version.previous=${{ steps.build-previous.outputs.built-version }}
           -Dbwc.version.next=${{ steps.build-next.outputs.built-version }} -i
-        build-root-directory: bwc-test
 
     - uses: actions/upload-artifact@v3
       if: always()