snapshot_backup: deny executing tidb-lightning import while running snapshot_backup (#47001)

[ti-chi-bot]

This is an automated cherry-pick of #47001

What problem does this PR solve?

Issue Number: ref #46850

Problem Summary:
See the issue.

What is changed and how it works?

A new RPC named "DenyImprotRpcs" has been added to TiKV, which allows us deny importing during backing up.

Check List

Tests

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

Release note

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

None

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[YuJuncen]

/retest-required

[YuJuncen]

/retest-required

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-16 08:13:06.240815959 +0000 UTC m=+1644783.827926105: ☑️ agreed by BornChanger.
• 2023-10-16 09:19:49.115444575 +0000 UTC m=+1648786.702554721: ☑️ agreed by YuJuncen.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-7.1@359aea8). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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