set request schema version when do remote read (#4021)

[ti-chi-bot]

This is an automated cherry-pick of #4021

What problem does this PR solve?

Issue Number: close #3967

Problem Summary: When do remote read, tiflash doesn't set schema version on the dag request. And if the schema info in the target machine is outdated, it will not try to sync schema, so it may raise some error like "Invalidate column id".

What is changed and how it works?

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

Fix potential query error after add column under heavy read workload

[ti-chi-bot]

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[ti-chi-bot]

@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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[lidezhu]

Need cherry-pick this pr before merge: #4090.

[CLAassistant]

All committers have signed the CLA.

[ti-chi-bot]

@ti-chi-bot: PR needs rebase.

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