[MNT] Switch to codecov

[surchs]

• Related to https://github.com/neurobagel/planning/issues/173

Changes proposed in this pull request:

-

Checklist

This section is for the PR reviewer

• [x] PR has an interpretable title with a prefix ([ENH], [FIX], [REF], [TST], [CI], [MNT], [INF], [MODEL], [DOC]) (see our Contributing Guidelines for more info)
• [x] PR has a label for the release changelog or skip-release (to be applied by maintainers only)
• [ ] PR links to GitHub issue with mention Closes #XXXX
• [ ] Tests pass
• [x] Checks pass

For new features:

• [ ] Tests have been added

For bug fixes:

• [ ] There is at least one test that would fail under the original bug conditions.

Summary by Sourcery

CI:

• Switch from Coveralls to Codecov for uploading coverage results in the GitHub Actions workflow.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This PR switches the code coverage reporting service from Coveralls to Codecov. The change is implemented by updating the GitHub Actions workflow file to replace the Coveralls upload action with the Codecov upload action.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Replace Coveralls with Codecov for code coverage reporting	Remove Coveralls GitHub Action configuration Add Codecov upload action configuration Remove GitHub token configuration as it's not required for Codecov	.github/workflows/test.yaml

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[codecov[bot]]

Welcome to Codecov :tada:

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered :open_umbrella: