*: upgrade the PD client to adopt the latest refactor

[JmPotato]

What problem does this PR solve?

Issue Number: ref #58439.

Problem Summary:

Upgrade the PD client to adopt the latest refactor.

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-23 06:44:16.60008954 +0000 UTC m=+1457646.688892082: ☑️ agreed by lance6716.
• 2024-12-23 06:56:16.887650588 +0000 UTC m=+1458366.976453131: ☑️ agreed by YuJuncen.

[codecov]

Codecov Report

Attention: Patch coverage is 62.88660% with 36 lines in your changes missing coverage. Please review.

Project coverage is 75.0498%. Comparing base (ef7ade7) to head (2ca052e).
Report is 2 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58440        +/-   ##
================================================
+ Coverage   73.5359%   75.0498%   +1.5139%     
================================================
  Files          1681       1726        +45     
  Lines        464055     472763      +8708     
================================================
+ Hits         341247     354808     +13561     
+ Misses       101997      95775      -6222     
- Partials      20811      22180      +1369     

Flag	Coverage Δ
integration	49.1579% <34.3750%> (?)
unit	72.4704% <54.7368%> (+0.1722%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.6910% <0.0000%> (ø)
parser	∅ <ø> (∅)
br	61.7100% <72.0000%> (+15.9433%)	⬆️

[JmPotato]

/test build

[tiprow]

@JmPotato: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test fast_test_tiprow
• /test fast_test_tiprow_ddlargsv1
• /test tidb_parser_test

Use /test all to run the following jobs that were automatically triggered:

• fast_test_tiprow
• tidb_parser_test

In response to this:

/test build

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716, tangenta, YuJuncen

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Needs approval from an approver in each of these files:

• OWNERS [YuJuncen,lance6716,tangenta]
• br/OWNERS [YuJuncen]
• dumpling/OWNERS [lance6716,tangenta]
• lightning/OWNERS [lance6716]
• pkg/ddl/OWNERS [lance6716,tangenta]
• pkg/disttask/OWNERS [lance6716,tangenta]
• pkg/domain/OWNERS [lance6716,tangenta]
• pkg/executor/importer/OWNERS [lance6716]
• pkg/lightning/OWNERS [lance6716]

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