[Docs / Tests]: Fix tests and README rendering

[QuentinWach]

• Added continue-on-error: true to the Codecov upload and badge download steps to prevent workflow failure on errors.
• Included a condition to check the success of the test-portable job before updating the coverage badge.
• Ensured the coverage badge is only committed if it exists, improving the robustness of the CI process.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Plan: Pro

Run ID: a35d8fdd-5e94-43be-ab18-82e9e4e12996

📥 Commits

Reviewing files that changed from the base of the PR and between 74f316e and 775e747.

📒 Files selected for processing (2)

• .github/workflows/tests.yml
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix2_latex

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