Remove workaround for codecov coverage uploads (#247)

This approach was used in order to fix flaky coverage uploads.
With the release of
[codecov-action@v5](#241),
the workaround does not seem to be necessary.

.github/workflows/test.yml

@@ -34,41 +34,10 @@ jobs:
       - name: Run tests with Coverage report enabled
         run: cargo llvm-cov test --all-features --workspace --codecov --locked --output-path codecov_report.json
 
-      - name: Store PR number and commit SHA
-        run: |
-          echo "Storing PR number ${{ github.event.number }}"
-          echo "${{ github.event.number }}" > pr_number.txt
-
-          echo "Storing commit SHA ${{ github.event.pull_request.head.sha }}"
-          echo "${{ github.event.pull_request.head.sha }}" > commit_sha.txt
-
-      # Workaround for https://github.com/orgs/community/discussions/25220
-      # Triggered sub-workflow is not able to detect the original commit/PR which is available
-      # in this workflow.
-      - name: Store PR number
-        uses: actions/upload-artifact@v4
+      - name: Upload coverage report to Codecov
+        uses: codecov/codecov-action@v5
         with:
-          name: pr_number
-          path: pr_number.txt
-
-      - name: Store commit SHA
-        uses: actions/upload-artifact@v4
-        with:
-          name: commit_sha
-          path: commit_sha.txt
-
-      # This stores the coverage report in artifacts. The actual upload to Codecov
-      # is executed by a different workflow `coverage-report.yml`. The reason for this
-      # split is because `on.pull_request` workflows don't have access to secrets.
-      - name: Store coverage report in artifacts
-        uses: actions/upload-artifact@v4
-        with:
-          name: codecov_report
-          path: codecov_report.json
-
-      - run: |
-          echo "The coverage report was stored in Github artifacts."
-          echo "It will be uploaded to Codecov using [coverage-report.yml] workflow shortly."
+          files: ./codecov_report.json
 
   test-other-books:
     strategy: