OpenShift Tests Extension - Milestone 1, MVP

Enhancement: https://github.com/openshift/enhancements/pull/1676

Goal

Implement initial support for executing test extension binaries within the `openshift-tests` framework. This includes extension registration, test listing, test execution, suite creation, and result collection.

Out of Scope

For the first milestone of OTE, the following items are deferred until later:

• OTE binaries from external non-payload sources
• Cluster "config" for different testing strategies
• OTE binary provided facts for environment selection
• Enhanced scheduling (consideration of duration and resource requirements for tests, as well as isolation)
• OTE binary provided monitor tests

Acceptance criteria

• Initial vendorable framework implemented
• Kubernetes repository migrated to OTE
• Annotations removed from Kube and origin
• Origin parts implemented including listing, executing, and discovering extensions
• Extension-definable test suites
• Extension-definable test images