Fix must-gather image references for 4.22

[fbladilo]

Summary

• Update image-references: must-gather entry from v4.21.0 to v4.22.0
• Update CSV MUSTGATHER_IMAGE env var from v4.21.0 to v4.22.0
• The stale v4.21.0 references prevented doozer from correctly resolving and pinning the must-gather image during bundle rebase
• This caused Konflux Enterprise Contract verification failure (olm.unpinned_references), blocking the prepare-release-konflux pipeline

Details

The CSV operators.openshift.io/must-gather-image annotation already referenced v4.22.0, but the image-references file and the MUSTGATHER_IMAGE env var in the CSV were still pointing to v4.21.0. Without consistent references, doozer couldn't pin the image to a digest, and EC rejected the unpinned tag reference.

Test plan

• Verify bundle builds pass EC verification after this change

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This pull-request has been approved by: fbladilo
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