Set labels for TiProxy instances

[djshow832]

What problem does this PR solve?

TiProxy needs to route to the local TiDB instances in the same AZ. To implement that, TiProxy needs to know its own AZ.

What is changed and how does it work?

• Set the labels to TiProxy by tiproxyctl when the TiProxy version >= v1.1.0. Most of the code is copied from TiDBMemberManager.
• Fix the URL that tiproxyctl uses. It used the server address, not pod addresses. Check defaultTiProxyControl.

Code changes

• [x] Has Go code change
• [ ] Has CI related scripts change

Tests

• [x] Unit test
• [ ] E2E test
• [x] Manual test
• [ ] No code

Manual test steps:

1. Start a tidb cluster with tiproxy
2. Set the location-labels on PD: ./pd-ctl config set replication.location-labels "zone"
3. Label the node: kubectl label node minikube zone="east"
4. Check the label of TiProxy:

   $ curl 127.1:3080/api/admin/config/ | grep zone
   zone = 'east'

Side effects

• [ ] Breaking backward compatibility
• [ ] Other side effects:

Related changes

• [ ] Need to cherry-pick to the release branch
• [ ] Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

- Support automatically set location labels for TiProxy

[csuzhangxc]

/run-all-tests

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csuzhangxc

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tidb-operator/blob/master/OWNERS)~~ [csuzhangxc] 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:

• 2024-05-16 14:22:48.279908522 +0000 UTC m=+1749522.037044087: :ballot_box_with_check: agreed by csuzhangxc.

[csuzhangxc]

/run-all-tests

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 2.94118% with 99 lines in your changes are missing coverage. Please review.

Project coverage is 32.35%. Comparing base (3897095) to head (076e427). Report is 7 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5649 +/- ## =========================================== - Coverage 61.46% 32.35% -29.11% =========================================== Files 235 219 -16 Lines 30397 30403 +6 =========================================== - Hits 18683 9837 -8846 - Misses 9840 19240 +9400 + Partials 1874 1326 -548 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5649/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5649/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `32.35% <2.94%> (?)` | | | [unittest](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5649/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `?` | |