client/tso: add a TSO wait failed duration observer

[JmPotato]

What problem does this PR solve?

Issue Number: ref #8281.

What is changed and how does it work?

Add a TSO wait failed duration observer.

Check List

Tests

• Unit test
• Integration test

Release note

None.

[codecov[bot]]

Codecov Report

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

Project coverage is 75.54%. Comparing base (60b960a) to head (4e8b4f5). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8763 +/- ## ========================================== + Coverage 75.52% 75.54% +0.01% ========================================== Files 461 461 Lines 72273 72275 +2 ========================================== + Hits 54587 54601 +14 + Misses 14182 14177 -5 + Partials 3504 3497 -7 ``` | [Flag](https://app.codecov.io/gh/tikv/pd/pull/8763/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/8763/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=tikv) | `75.54% <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: nolouch, rleungx

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

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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:

• 2024-11-04 03:55:55.710873482 +0000 UTC m=+840468.550029030: :ballot_box_with_check: agreed by rleungx.
• 2024-11-04 05:28:40.754938392 +0000 UTC m=+846033.594093935: :ballot_box_with_check: agreed by nolouch.