backup: added ebs-warmup for restoring from EBS snapshots (#5238)

[ti-chi-bot]

This is an automated cherry-pick of #5238

What problem does this PR solve?

This PR added a new image named ebs-warmup which supports scanning the newly restored volumes. So we can get rid of the poor performance while the volume contents are still pending in S3.

What is changed and how does it work?

For example:
cc #5229
This newly added image is for the WarmUp stage of restoring.

Close #5224

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test (I think the E2E might be done along with volume restore. But I'm not sure whether there are infra for them.)
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

None

[ti-chi-bot]

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