Revert "Mirror v0.21.1 test images of wathola"

[cardil]

Reverts #18873

This is also needed to openshift/knative-eventing#1285 can restore previous code.

[cardil]

/cc @mgencur
/cc @matzew

[openshift-ci]

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[openshift-ci]

@cardil: PR needs rebase.

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[cardil]

This has become obsolete by #19131 and openshift-knative/serverless-operator#983