lightning: check write stall when switch-mode is disabled

[sleepymole]

What problem does this PR solve?

Issue Number: close #40163

Problem Summary:

Although TiKV checks write stall before ingesting, it doesn't work on the follower node of the region. https://github.com/tikv/tikv/blob/8864e9bac814554bbe4acaddd01282f5fdae3dae/src/import/sst_service.rs#L181. To avoid write stall on follower node, Lightning should also check write stall before ingesting data to each peer of the region.

What is changed and how it works?

When swtich-mode is disabled, we assume Lightning is importing to data to an online cluster. Then before ingesting, use an empty MultiIngestRequest to check whether ingesting may cause write stall on every peer of the region.

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.

None

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[sleepymole]

/hold

Need to think about how to add tests.

[lance6716]

I added a unit test that verify MultiIngest to all peers is sent in #40228.

90a3c7a

[lance6716]

test is added in #40228

[sleepymole]

@lance6716 It seems this PR can be replaced by #40228. I will close this PR. Please update the title and description of #40228.