Push tidb-backup-manager v2 only to GCR for now

[ideascf]

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[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

Key Changes

• The pull request updates the delivery.yaml file to specify that only version v2 of tidb-backup-manager images should be pushed to gcr.io/pingcap-public/dbaas/tidb-backup-manager.

Potential Problems

• The description for v1 version images is updated to mention v1, but the actual regex pattern is still for v2 versions. This could be a mistake.
• The v2 version images are only being pushed to GCR (gcr.io/pingcap-public/dbaas/tidb-backup-manager). Make sure this is the intended behavior and aligns with the project's image distribution strategy.

Fixing Suggestions

• Update the tags_regex for v1 version images to match the new description (e.g., ^(v1[.][0-9]+[.][0-9]+)(-.+)?$).
• If pushing v2 version images only to GCR is intentional, ensure it is documented and aligns with the project's image distribution strategy. If there are additional repositories where v2 images should be pushed, update the dest_repositories accordingly.

Overall, it's important to ensure consistency between the image version descriptions and the regex patterns used to match those versions. Also, verify that the image distribution strategy aligns with project requirements.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wuhuizuo

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-24 03:33:49.536029667 +0000 UTC m=+240377.489187931: ☑️ agreed by wuhuizuo.