*: 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

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[tiprow]

@JmPotato: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	85d7ad9	link	true	/test fast_test_tiprow

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[ti-chi-bot]

@JmPotato: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	85d7ad9	link	true	/test build
pull-integration-e2e-test	85d7ad9	link	true	/test pull-integration-e2e-test
idc-jenkins-ci-tidb/check_dev	85d7ad9	link	true	/test check-dev
pull-br-integration-test	85d7ad9	link	true	/test pull-br-integration-test
pull-integration-ddl-test	85d7ad9	link	true	/test pull-integration-ddl-test
pull-mysql-client-test	85d7ad9	link	true	/test pull-mysql-client-test
idc-jenkins-ci-tidb/mysql-test	85d7ad9	link	true	/test mysql-test
idc-jenkins-ci-tidb/check_dev_2	85d7ad9	link	true	/test check-dev2
pull-lightning-integration-test	85d7ad9	link	true	/test pull-lightning-integration-test
pull-unit-test-ddlv1	85d7ad9	link	true	/test pull-unit-test-ddlv1
idc-jenkins-ci-tidb/unit-test	85d7ad9	link	true	/test unit-test

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.