log-backup: remove k-v record in etcd when stop log-backup task (#40431)

[ti-chi-bot]

This is an automated cherry-pick of #40431

Signed-off-by: joccau zak.zhao@pingcap.com

What problem does this PR solve?

Issue Number: close #40403

Problem Summary:

What is changed and how it works?

Remove checkpoint-ts from etcd about log-backup task if delete task.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• 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.

Fix issue: Remove checkpoint-ts from etcd about log-backup task if delete task.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• joccau

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[joccau]

LGTM

[joccau]

/run-integration-br-test

[joccau]

/test unit-test

[joccau]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 59d890d

[joccau]

/test check_dev_2

[ti-chi-bot]

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[joccau]

/test check-dev2

[joccau]

/test mysql-test