Fix the association of code coverage results with source code (opense…

…arch-project#3668)

### Description
Fix the association of code coverage results with source code. You'll
have seen how this was broken because we stopped getting the comment on
PRs with coverage information. My apologies for breaking this in the
most recent change to centralized the CC runs.

### Issues Resolved
- Resolves opensearch-project#2649

### Testing
✅ Inspection CC report on this PR, see
[[link]](opensearch-project#3668 (comment)).

### 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/workflows/ci.yml

@@ -73,6 +73,7 @@ jobs:
       - "integration-tests"
     runs-on: ubuntu-latest
     steps:
+      - uses: actions/checkout@v4
       - uses: actions/download-artifact@v3
         with:
           path: downloaded-artifacts
@@ -101,7 +102,6 @@ jobs:
           with: |
             token: ${{ secrets.CODECOV_TOKEN }}
             fail_ci_if_error: true
-            directory: downloaded-artifacts
             verbose: true