feat(infra): Add backend selective testing workflow #105500
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Adds a "shadow job" (i.e. non-required workflow) to run on PRs alongside backend tests leveraging selective testing. This selective testing strategy uses changed files and code coverage data to determine what test files to run based on what files changed. Our approach is quite lax here, when in doubt (missing coverage data, file in an allowlist) we'll default to running all tests. But generally we want to gather data from this as a non-blocking PR check so this seems like the best start and we can iteratively improve.
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Adds a "shadow job" (i.e. non-required workflow) to run on PRs alongside backend tests leveraging selective testing. This selective testing strategy uses changed files and code coverage data to determine what test files to run based on what files changed.
Our approach is quite lax here, when in doubt (missing coverage data, file in an allowlist) we'll default to running all tests. But generally we want to gather data from this as a non-blocking PR check so this seems like the best start and we can iteratively improve.