Set fail-on-error to false in CI workflow

[harryswift01]

Summary

This PR updates the CI coverage configuration to prevent failures caused by intermittent downtime from Coveralls. By setting the coverage step to fail-on-error: false, we ensure that CI runs are not marked as failed due to external service instability rather than issues within the codebase.

Changes

Make coverage reporting non-blocking:

• Updated the CI configuration to set the Coveralls step to fail-on-error: false.
• Prevented CI pipelines from failing when Coveralls is unavailable or experiencing downtime.
• Ensured coverage reporting continues to run without impacting overall build success.

Impact

• Improves CI reliability by removing dependency on Coveralls uptime for build success.
• Prevents false-negative CI failures caused by external service outages.
• Maintains coverage reporting without disrupting workflows.