scheduler: add new api to add a new job for the special scheduler

[bufferflies]

What problem does this PR solve?

Issue Number: Close #9161

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has the configuration change
• Has HTTP API interfaces changed (Don't forget to add the declarative for the new API)
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• PR to update pingcap/tiup:
• Need to cherry-pick to the release branch

Release note

None.

[ti-chi-bot[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 56.82657% with 117 lines in your changes missing coverage. Please review.

Project coverage is 76.02%. Comparing base (d11f535) to head (f2aa0fb). Report is 1 commits behind head on master.

:x: Your patch status has failed because the patch coverage (56.82%) is below the target coverage (74.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9162      +/-   ##
==========================================
+ Coverage   75.97%   76.02%   +0.05%     
==========================================
  Files         472      472              
  Lines       73045    73249     +204     
==========================================
+ Hits        55497    55690     +193     
- Misses      14100    14104       +4     
- Partials     3448     3455       +7     

Flag	Coverage Δ
unittests	76.02% <56.82%> (+0.05%)	:arrow_up:

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[bufferflies]

/test

[ti-chi-bot[bot]]

@bufferflies: The /test command needs one or more targets. The following commands are available to trigger required jobs:

/test build

/test pull-integration-realcluster-test

The following commands are available to trigger optional jobs:

/debug pull-unit-test

/test pull-integration-copr-test

Use /test all to run the following jobs that were automatically triggered:

tikv/pd/ghpr_build

tikv/pd/pull_integration_realcluster_test

In response to this:

/test

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[bufferflies]

/retest

[bufferflies]

/ping @nolouch @okJiang

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2025-04-28 12:12:12.540483898 +0000 UTC m=+876076.352274272: :ballot_box_with_check: agreed by lhy1024.
• 2025-04-29 07:52:19.282380931 +0000 UTC m=+946883.094171312: :ballot_box_with_check: agreed by okJiang.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• ~~OWNERS~~ [lhy1024,nolouch]

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