br: Add retry limit of connection err in fine grained backup (#57713)

[ti-chi-bot]

This is an automated cherry-pick of #57713

What problem does this PR solve?

Issue Number: close #57449

Problem Summary:

The fine grained backup may fails into infinite retry when encounter disconnect err.

What changed and how does it work?

Add a retry limit of 3 to each store.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Try to make error in resp 3 times, will get:

Error: failed to connect to store 1 for 3 times: failed to connect to store 1: [BR:Common:ErrFailedToConnect]failed to make gRPC channels

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]

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Adding the do-not-merge/cherry-pick-not-approved label.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-7.1@6722c39). Learn more about missing BASE report.

Additional details and impacted files

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