feat: added code coverage reporting (#9081)

* added code coverage reporting

* fix issues

* more cleanup

* fix action configs

* cleanup token debug

* added comments to codecov.yml config

---------

Co-authored-by: Edwin Jose <edwin.jose@datastax.com>

.github/workflows/python_test.yml

@@ -7,6 +7,8 @@ on:
         required: true
       ANTHROPIC_API_KEY:
         required: true
+      CODECOV_TOKEN:
+        required: false
     inputs:
       python-versions:
         description: "(Optional) Python versions to test"
@@ -50,11 +52,13 @@ jobs:
       - uses: actions/checkout@v4
         with:
           ref: ${{ inputs.ref || github.ref }}
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         id: setup-node
         with:
           node-version: ${{ env.NODE_VERSION }}
+
       - name: "Setup Environment"
         uses: astral-sh/setup-uv@v6
         with:
@@ -62,15 +66,37 @@ jobs:
           cache-dependency-glob: "uv.lock"
           python-version: ${{ matrix.python-version }}
           prune-cache: false
+
       - name: Install the project
         run: uv sync
+
       - name: Run unit tests
         uses: nick-fields/retry@v3
         with:
           timeout_minutes: 12
           max_attempts: 2
-          command: make unit_tests args="-x -vv --splits ${{ matrix.splitCount }} --group ${{ matrix.group }} --reruns 5"
+          command: make unit_tests args="-x -vv --splits ${{ matrix.splitCount }} --group ${{ matrix.group }} --reruns 5 --cov --cov-report=xml --cov-report=html"
 
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v5
+        if: matrix.python-version == '3.10'
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.xml
+          flags: backend
+          name: backend-coverage-group-${{ matrix.group }}
+          fail_ci_if_error: false
+          directory: ./
+
+      - name: Upload coverage artifacts
+        uses: actions/upload-artifact@v4
+        if: matrix.python-version == '3.10'
+        with:
+          name: backend-coverage-report-group-${{ matrix.group }}
+          path: |
+            coverage.xml
+            htmlcov/
+          retention-days: 30
 
 
   integration-tests: