Improvements to validate_toolchain for release testing

[AdamSaleh]

This is no longer just cherrypick from v1.19 branch.

Because the validate_toolchain test needs frequent updates, I changed it to use external file to store the expected versions. It also provides a mechanism to automatically update the values from the server under test. In future this could lead to self-updating tests, where on failure, a new PR would be opened automatically with the versions that the test actually saw available for review.

Also, a signifficant improvement is that the test feilure now looks like:

 [FAILED] Expected
<map[string]string | len:5>: {
"argocd": "v3.3.2",
"dex": "v2.43.0",
"helm": "v3.19.4",
"kustomize": "v5.8.1",
"redis": "7.2.11",
}
to equal
<map[string]string | len:5>: {
"argocd": "v3.3.0",
"dex": "v2.43.0",
"helm": "v3.19.4",
"kustomize": "v5.8.1",
"redis": "7.2.11",
}

instead of previously investigation requiring Expected "v3.3.2" to equal "v3.3.0" :)

This PR was written with assistance of claude code.

[openshift-ci]

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[openshift-ci]

PR needs rebase.

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[jgwest]

/retest

[openshift-ci]

@AdamSaleh: 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/unit	677a234	link	true	/test unit
ci/prow/v4.19-kuttl-parallel	677a234	link	true	/test v4.19-kuttl-parallel
ci/prow/v4.19-ci-index-gitops-operator-bundle	677a234	link	true	/test v4.19-ci-index-gitops-operator-bundle
ci/prow/v4.14-kuttl-sequential	677a234	link	false	/test v4.14-kuttl-sequential
ci/prow/v4.14-kuttl-parallel	677a234	link	false	/test v4.14-kuttl-parallel
ci/prow/v4.19-kuttl-sequential	677a234	link	true	/test v4.19-kuttl-sequential
ci/prow/v4.14-e2e	677a234	link	true	/test v4.14-e2e
ci/prow/v4.14-images	677a234	link	true	/test v4.14-images
ci/prow/v4.14-ci-index-gitops-operator-bundle	677a234	link	true	/test v4.14-ci-index-gitops-operator-bundle
ci/prow/v4.19-e2e	677a234	link	true	/test v4.19-e2e
ci/prow/v4.19-images	677a234	link	true	/test v4.19-images

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