WIP: Use opm in tekton pipelines

[dsimansk]

/cc @Kaustubh-pande @rudyredhat1

[openshift-ci]

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[dsimansk]

Being tested here: openshift-knative/serverless-operator#4033

[dsimansk]

@Kaustubh-pande it's ready for the review. I've tried to test the changed in the PR linked above.

We will need to clean up pre-generated catalog files from S-O before this change, and disable regen in GH action. Otherwise it should work fine. And finally, we should probably enable renovate to bump catalog-template.json reference to serverless-bundle. That would wrap the whole update loop.