br: ebs tags refactoring (#44381)

[ti-chi-bot]

This is an automated cherry-pick of #44381

What problem does this PR solve?

Issue Number: close #43934

Problem Summary:

What is changed and how it works?

This pr refactored to

1. carry all tags of ebs volume to the snapshots as they are
2. carry tags for snapshots to restored volume whose keys of tags are prefixed with "snapshot/"

Check List

Tests

• Unit test

• Integration test

• Manual test (add detailed scripts or steps below)
  Verify the logic by EBS snapshot backup and restore, take one volume as example,
  original tags
  
  snapshot for the volume
  
  tags for restored volume
  

• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[BornChanger]

/cherry-pick-invite @BornChanger

[ti-chi-bot]

@BornChanger you're already a collaborator in repo ti-chi-bot/tidb

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, YuJuncen

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• OWNERS [YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-29 07:46:45.691017168 +0000 UTC m=+866571.092267616: ☑️ agreed by BornChanger.
• 2023-06-30 15:23:12.536097822 +0000 UTC m=+99075.910675676: ☑️ agreed by YuJuncen.