etcd/path: change leaderPath/dcLocationPath/memberPath/allocalIDPath to absolute path

[okJiang]

What problem does this PR solve?

Issue Number: Ref https://github.com/tikv/pd/issues/8582

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Release note

None.

[okJiang]

/retest

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 97.61905% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.35%. Comparing base (ec77762) to head (ca1da7e). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8789 +/- ## ========================================== + Coverage 75.19% 75.35% +0.15% ========================================== Files 459 460 +1 Lines 71299 71323 +24 ========================================== + Hits 53616 53745 +129 + Misses 14266 14183 -83 + Partials 3417 3395 -22 ``` | [Flag](https://app.codecov.io/gh/tikv/pd/pull/8789/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/8789/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv) | `75.35% <97.61%> (+0.15%)` | :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.

---

🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[okJiang]

/retest

[okJiang]

/retest

[okJiang]

/retest

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nolouch, rleungx

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/tikv/pd/blob/master/OWNERS)~~ [nolouch,rleungx] 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:

• 2024-11-15 06:46:20.23215123 +0000 UTC m=+597942.423020223: :ballot_box_with_check: agreed by nolouch.
• 2024-11-25 06:33:38.067468158 +0000 UTC m=+445405.687122672: :ballot_box_with_check: agreed by rleungx.

[okJiang]

/retest