*: remove the previous joined pd

[rleungx]

What problem does this PR solve?

Issue Number: Close #7954.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.60%. Comparing base (6998fb5) to head (ef3a5dc). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8562 +/- ## ======================================= Coverage 77.59% 77.60% ======================================= Files 474 474 Lines 61883 61885 +2 ======================================= + Hits 48019 48024 +5 + Misses 10334 10324 -10 - Partials 3530 3537 +7 ``` | [Flag](https://app.codecov.io/gh/tikv/pd/pull/8562/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/tikv/pd/pull/8562/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv) | `77.60% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv#carryforward-flags-in-the-pull-request-comment) to find out more.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HuSharp, lhy1024

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/tikv/pd/blob/master/OWNERS)~~ [HuSharp,lhy1024] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-08-26 08:59:01.860562071 +0000 UTC m=+774336.995012193: :ballot_box_with_check: agreed by HuSharp.
• 2024-08-27 02:49:54.549446433 +0000 UTC m=+838589.683896548: :ballot_box_with_check: agreed by lhy1024.

[HuSharp]

ci failed because meeting panic :( https://github.com/tikv/pd/actions/runs/10570839546/job/29285961014?pr=8562

2024-08-27T02:54:35.0538010Z [FAIL]  mcs/scheduling TestAPI
2024-08-27T02:54:35.2144314Z === RUN   TestAPI/TestFollowerForward
2024-08-27T02:54:35.2144959Z === NAME  TestAPI
2024-08-27T02:54:35.2145730Z     testutil.go:337: start test TestFollowerForward in pd mode
...
2024-08-27T02:54:35.8353903Z [2024/08/27 02:54:34.947 +00:00] [PANIC] [cluster.go:859] ["failed to find local ID in cluster members"] [cluster-id=b2fe976be7a757da] [local-member-id=6c281856cbb0ddbe]
2024-08-27T02:54:35.8354083Z panic: failed to find local ID in cluster members

[HuSharp]

/hold

[HuSharp]

/unhold