client: expose new api to cancel scheduler job

[bufferflies]

What problem does this PR solve?

Issue Number: Close #9285

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test

Code changes

Side effects

Related changes

Release note

None.

[ti-chi-bot]

Skipping CI for Draft Pull Request.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.03%. Comparing base (7c3b9a3) to head (1bbc0b1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9239      +/-   ##
==========================================
+ Coverage   75.96%   76.03%   +0.07%     
==========================================
  Files         472      472              
  Lines       73249    73256       +7     
==========================================
+ Hits        55646    55703      +57     
+ Misses      14131    14099      -32     
+ Partials     3472     3454      -18     

Flag	Coverage Δ
unittests	76.03% <100.00%> (+0.07%)	⬆️

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[Copilot]

Pull Request Overview

This PR adds a new API to cancel scheduler jobs in PD and updates the client and integration tests accordingly.

• Introduces CancelSchedulerJob as a new method in the client interface and its implementation.
• Adds a URI generator function for the cancel operation in the API layer.
• Updates integration tests to verify that the scheduler job cancellation behaves as expected.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/integrations/client/http_client_test.go	Updates to test job cancellation behavior
client/http/request_info.go	Added constant for cancel scheduler job request
client/http/interface.go	Introduced method and implementation for canceling a scheduler job
client/http/api.go	Added URI function for cancel scheduler job

Comments suppressed due to low confidence (1)

tests/integrations/client/http_client_test.go:615

• [nitpick] Consider renaming 'checkFn' to a more descriptive name such as 'getJobDetails' to improve test readability.

checkFn := func() map[string]any {

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Details

Needs approval from an approver in each of these files:

• OWNERS [lhy1024]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-04-30 04:32:08.625149701 +0000 UTC m=+1021272.436940082: ☑️ agreed by lhy1024.
• 2025-04-30 06:03:19.218102268 +0000 UTC m=+1026743.029892699: ☑️ agreed by okJiang.