br: copy full backup to pitr storage

[YuJuncen]

What problem does this PR solve?

Issue Number: close #(TBD)

Problem Summary:
Now, a log backup task cannot back full restorations happen in the cluster up.

What changed and how does it work?

This PR makes BR upload the SSTs it imported to the log backup storage.

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.

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

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[tiprow]

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