[SDTEST-160] Implement code coverage metrics for internal telemetry

DataDog / datadog-ci-rb

Ruby library for Datadog test visibility

https://docs.datadoghq.com/continuous_integration/tests/ruby

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[SDTEST-160] Implement code coverage metrics for internal telemetry #203

Closed anmarchenko closed 2 months ago

anmarchenko commented 3 months ago

What does this PR do? Adds code coverage metrics to internal telemetry.

Additional Notes Note that code_coverage.errors metric is unused and remove. Code coverage collection in this library is "error-free" as any potential fatal bug in native extension will most likely cause segfault and crash of the Ruby process.

How to test the change? Unit tests are provided