br/operator: added some commands for managing migrations

[YuJuncen]

What problem does this PR solve?

Issue Number: close #56760

Problem Summary:
We need some commands for operating log backup.

What changed and how does it work?

We added such commands. See the linked issue for more details.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Release note

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

Added three experimental commands for `br operator`: `list-migrations`(list compactions and truncated ts), `migrate-to`(remove compacted log files) and `base64ify`(convert storage url to base64, which is acceptable by `tikv-ctl`.)

[tiprow]

Hi @YuJuncen. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 14.23488% with 241 lines in your changes missing coverage. Please review.

Project coverage is 57.4911%. Comparing base (7292117) to head (8188883).
Report is 59 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #56857         +/-   ##
=================================================
- Coverage   73.2789%   57.4911%   -15.7879%     
=================================================
  Files          1636       1782        +146     
  Lines        453658     642652     +188994     
=================================================
+ Hits         332436     369468      +37032     
- Misses       100846     248614     +147768     
- Partials      20376      24570       +4194     

Flag	Coverage Δ
integration	38.5720% <14.2348%> (?)
unit	72.9624% <14.2348%> (+0.4744%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.9478% <ø> (ø)
parser	∅ <ø> (∅)
br	62.6612% <14.2348%> (+16.6813%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, Leavrth

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,Leavrth]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-30 08:55:46.288063523 +0000 UTC m=+426459.127219068: ☑️ agreed by 3pointer.
• 2024-11-04 09:06:10.567611442 +0000 UTC m=+859083.406766987: ☑️ agreed by Leavrth.

[tiprow]

@YuJuncen: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	8188883	link	true	/test fast_test_tiprow

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