Auto-ping CODEOWNERS on Codeflow PR test failures

When a Codeflow PR for the SDK has failing tests, we currently rely on build duty to manually identify the relevant test owner and notify them. Add automation so that on test failure, the system determines the failing test’s path and checks whether that path is covered by an owner entry in the repo’s CODEOWNERS file. If an owner is found, have AI automatically post a PR comment pinging the owner(s) with a brief summary and link to the failing test output, so ownership routing happens immediately without requiring human intervention.