add command for test coverage

[cpmeadors]

PoC for analyzing test coverage and making it easier to understand. It just runs unit tests and looks for coverage files anywhere and then spits out a summary with recommendations. Coverage reports should probably be centralized. Also, other test suites should be run but they need more complex setup.

Test with claude: /coverage-summary

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cpmeadors

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[openshift-ci]

@cpmeadors: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/test-e2e-4-18	8c552d3	link	true	/test test-e2e-4-18
ci/prow/test-e2e-downstream-4-21	8c552d3	link	true	/test test-e2e-downstream-4-21
ci/prow/test-e2e-upstream-4-21	8c552d3	link	true	/test test-e2e-upstream-4-21

Full PR test history. Your PR dashboard.

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