[Feature]: Enable the CI to detect missing suites / case

[wangyb-A]

Problem / motivation

Currently CI are set to run the test cases with each suite. If new suite / test cases are added in the conformance test suite, the CI cannot detect / run them automatically. Provide a way in the test runner to provide coverage info of the test suites

Proposed solution

Add a coverage option for the test runner, which only provides the yaml coverage without running the test cases. This can be used by the CI to detect coverage gaps

Alternatives considered

No response

Additional context

No response