Use compat_otp library in extended test cases

[sergiordlr]

- What I did
WIP

We hit this: openshift-eng/openshift-tests-extension#41

Summary

The test list was empty because the default ModuleTestsOnly() filter was excluding ALL tests that had any /vendor/ path in their code locations array. Since our MCO tests use compat_otp from the origin library, their code locations
include paths like:

/home/fedora/Workspace/machine-config-operator/vendor/github.com/openshift/origin/test/extended/util/client.go:183

Even though the PRIMARY code location was:
/home/fedora/Workspace/machine-config-operator/test/extended/mco_ocb.go:13

The standard ModuleTestsOnly() filter (which checks if ANY code location contains /vendor/) was filtering them out.

The Fix:
I implemented a custom filter in cmd/machine-config-tests-ext/main.go that only filters out tests where the FIRST (primary) code location is in the vendor directory. This allows our MCO tests, which are defined in test/extended/ but
call into compat_otp utilities, to be included in the test list.

- How to verify it

- Description for the changelog

[openshift-ci]

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[openshift-ci]

@sergiordlr: 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	c3ca88d	link	true	/test verify
ci/prow/okd-scos-e2e-aws-ovn	c3ca88d	link	false	/test okd-scos-e2e-aws-ovn
ci/prow/e2e-hypershift	c3ca88d	link	true	/test e2e-hypershift
ci/prow/bootstrap-unit	c3ca88d	link	false	/test bootstrap-unit
ci/prow/e2e-aws-ovn	c3ca88d	link	true	/test e2e-aws-ovn
ci/prow/unit	c3ca88d	link	true	/test unit
ci/prow/e2e-gcp-op-1of2	c3ca88d	link	true	/test e2e-gcp-op-1of2
ci/prow/e2e-aws-ovn-upgrade	c3ca88d	link	true	/test e2e-aws-ovn-upgrade
ci/prow/e2e-gcp-op-single-node	c3ca88d	link	true	/test e2e-gcp-op-single-node
ci/prow/e2e-gcp-op-2of2	c3ca88d	link	true	/test e2e-gcp-op-2of2
ci/prow/verify-deps	c3ca88d	link	true	/test verify-deps
ci/prow/images	c3ca88d	link	true	/test images
ci/prow/okd-scos-images	c3ca88d	link	true	/test okd-scos-images

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[openshift-merge-robot]

PR needs rebase.

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