Add codecov integration to CI

[Copilot]

Adds code coverage reporting to the CI pipeline using Codecov, following the pattern from falkordb-py.

Changes

• pyproject.toml: Added pytest-cov>=5.0.0,<6.0.0 to test dependencies
• .gitignore: Excluded coverage artifacts (.coverage, coverage.xml, htmlcov/)
• .github/workflows/test.yml:
  • Updated pytest command to --cov=graphrag_sdk --cov-report=xml
  • Added codecov upload step using codecov/codecov-action@v5

Configuration Required

Repository maintainers need to add CODECOV_TOKEN secret in GitHub settings and set up the repository on codecov.io.

The upload is configured with fail_ci_if_error: false to prevent CI failures from Codecov service issues.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add code coverage to the CI</issue_title>
<issue_description>Add codecov report to the CI see https://github.com/FalkorDB/falkordb-py as reference </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add code coverage to the CI #168

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