add ut for pkg/controllers/job/plugins

[googs1025]

What type of PR is this?

unit test

What this PR does / why we need it:

• add some unit test for pkg/controllers/job/plugins

Which issue(s) this PR fixes:

See more detail https://github.com/volcano-sh/volcano/issues/3053#issuecomment-2042837878

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

None

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: To complete the pull request process, please assign shinytang6 You can assign the PR to them by writing /assign @shinytang6 in a comment when ready.

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

Needs approval from an approver in each of these files:

• pkg/controllers/OWNERS

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[googs1025]

[googs1025]

I noticed that the test coverage in pkg/controllers can be improved. I will submit separate PRs to enhance this aspect.

[googs1025]

@hwdef @Monokaix /PTAL

[googs1025]

@hwdef /PTAL thanks!