server, client: Deprecate old GC related APIs

[MyonKeminta]

What problem does this PR solve?

Issue Number: Close #8978

What is changed and how does it work?

This PR migrates the old GC APIs to the new implementation, and marks them as deprecated.
Also suppresses warnings on necessary invocations to them, such as tests.

• Requires: client: Update PD Client interface and supports the new GC API #9203
• Diff: MyonKeminta/pd@m/new-gc-api-client...m/deprecate-old-gc-api

Check List

Tests

• Unit test

Code changes

-

Side effects

• Possible performance regression
• Increased code complexity

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

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