OSASINFRA-4209: Migrate to openshift-tests-extension (OTE)

[mandre]

Migrate to OTE using the ote-migration skill [1].

Add cmd/extension/main.go as a new OTE-based test extension binary
alongside the existing openshift-tests entry point. This registers
all openstack tests with the OTE framework, adds [OTP] annotations
to all Describe blocks, and integrates the extension build into the
Makefile and Containerfile.

The OTE binary discovers 51 tests and does not pull in origin's
monitor test framework, avoiding the duplicate test results seen
with the old entry point.

[1] https://github.com/openshift-eng/ai-helpers/tree/main/plugins/ote-migration

[openshift-ci-robot]

@mandre: This pull request references OSASINFRA-4209 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "5.0.0" version, but no target version was set.

Details

In response to this:

Migrate to OTE using the ote-migration skill [1].

[1] https://github.com/openshift-eng/ai-helpers/tree/main/plugins/ote-migration

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[openshift-ci]

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[mandre]

This likely will have to be 3 separated PRs so that we can test and merge without breaking CI.

[mandre]

I've dropped the last 2 commits that I'll restore in separate PRs once the CI shows the new entry point works well.

[openshift-ci]

@mandre: 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/verify	1bc1305	link	true	/test verify
ci/prow/test	1bc1305	link	true	/test test

Full PR test history. Your PR dashboard.

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