DNM A demo shows removing check_snapshot will cause region overlap

[CalvinNeo]

What is changed and how it works?

Issue Number: Close #xxx

What's Changed:

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

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

Release note

[CalvinNeo]

test_apply_before_snapshot 2024/08/19 16:24:57.212 peer.rs:3540: [INFO] region overlapped, snap: id: 1 region_epoch { conf_ver: 2 version: 2 } peers { id: 1 store_id: 1 } peers { id: 1112 store_id: 2 role: Learner }, exist: id: 1000 end_key: 6B32 region_epoch { conf_ver: 2 version: 2 } peers { id: 1001 store_id: 1 } peers { id: 1002 store_id: 2 role: Learner }, peer_id: 1112, region_id: 1, thread_id: 73

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Test name	Commit	Details	Required	Rerun command
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