lightning: always retry from rescan when NotLeader

[lance6716]

This is an manually cherry-pick of #43079

What problem does this PR solve?

Issue Number: close #43055

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code
  without this fix, the newly added UT fails (I added a panic when error is not nil)

panic: write to tikv with no leader returned, region '1', leader: 0

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

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• D3Hunter
• niubell

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[niubell]

LGTM

[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: 0400308

[lance6716]

/retest

[lichunzhu]

/retest

[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: af0d215

[lance6716]

/merge

[ti-chi-bot]

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

Commit hash: b7d26f8

[lance6716]

/cherry-pick release-6.1

[ti-chi-bot]

@lance6716: new pull request created to branch release-6.1: #45135.

In response to this:

/cherry-pick release-6.1

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