ci: Add back Coveralls coverage tool

[BAStos525]

Context

llvm-cov coverage doesn't work with SonarQube.

Solution

Add Action to upload coverage report to Coveralls.

• [ ] I've read CONTRIBUTING.md.
• [ ] (optional) I've written unit tests for the code changes.
• [ ] All review comments have been resolved.
• [ ] All CI checks pass.

[BAStos525]

Blocked by https://github.com/codecov/codecov-action/issues/1602

I'll try Coveralls