Build: Automate updating quay-operator operator manifests in dist-git from upstream github

OSBS provides certain capabilities to support updating operator manifests. Explore some of these options:

1. Using render_templates - https://cpaas.pages.redhat.com/documentation/schema/product/builds/brew_operator.html
2. Pinning operator - https://osbs.readthedocs.io/en/latest/admins.html#operator-manifests
3. https://osbs.readthedocs.io/en/latest/users.html#pullspec-locations

Acceptance criteria

• No manual steps are needed for building a z or y-stream for the first time (see related gchat for context)
  • this relates to related to dist-git or gerrit repos, AFAIK we'll still need to manually update the product.yaml in gitlab with the correct product version
• All version pointers in the operator manifests in dist-git are updated to the next product version (based on CPaaS env vars, see related docs for details) after build-pipeline jenkins build runs.
  • note: gerrit distgit directory is unaffected
• All operator CSVs related images (in gerrit distgit dir) use the "latest" tag. The render_templates (or other similar solution) updates the tag according to the version being built. This is needed for the check-patch job, see the related CPaaS issue for details