clear old range before apply snapshot (#4668)

[ti-chi-bot]

This is an automated cherry-pick of #4668

What problem does this PR solve?

Issue Number: close #4414

Problem Summary:

What is changed and how it works?

Check List

Tests

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

1. load data into tidb cluster with multiple tiflash nodes by import csv file and set tiflash replica to 1;
2. set tiflash replica to 0 and see whether the data can be reclaimed;

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

Avoid leaving data on tiflash node which doesn't corresponding to any region range

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CalvinNeo
• gengliqi

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[CalvinNeo]

LGTM

[lidezhu]

/merge

[ti-chi-bot]

@lidezhu: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 417bb45