Summary: Prepare and build FBCs for all supported OpenShift versions

Description: Create and update File-Based Catalogs for each supported OCP version. This involves updating catalog templates, rendering catalog files, and triggering FBC builds.

Acceptance Criteria: For each supported OCP version (4.18, 4.19, 4.20, and 4.21):
 

• Determine if this is first time for this release version
• If first time: Add new version and bundle line to fbc/catalog-template.yaml
• If version exists: Run fbc/update.sh to update catalog-template.yaml with latest reference
• Run fbc/render.sh to update catalog.json file based on template
• Validate FBC build is triggered automatically
• Confirm automated stage release for FBC completes
• Verify FBC snapshots are created correctly
• Reference example PR:
  • https://github.com/openshift/sandboxed-containers-operator/pull/1019
  • https://github.com/openshift/sandboxed-containers-operator/pull/1401