pdutil/backend: enlarge max retry time and fix nested retriable error (#48210)

[ti-chi-bot]

This is an automated cherry-pick of #48210

What problem does this PR solve?

Issue Number: close #46950, #48075

Problem Summary:

What is changed and how it works?

• enlarge max retry time of pd request
• fix nested retriable net error

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.

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

[D3Hunter]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-02 07:46:35.034661003 +0000 UTC m=+3111992.621771140: ☑️ agreed by D3Hunter.
• 2023-11-02 08:06:13.228749637 +0000 UTC m=+3113170.815859766: ☑️ agreed by wjhuang2016.

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, Benjamin2037, D3Hunter, wjhuang2016

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• br/pkg/lightning/OWNERS [Benjamin2037,D3Hunter]

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[D3Hunter]

/retest