fix: log when outputting preempt error

[googs1025]

What type of PR is this?

log when outputting preempt error

What this PR does / why we need it:

• log when outputting preempt error：preempt should be an important method. If an error occurs, a log should be printed.
• refector the judgment statement of allocate action to make it more readable

Which issue(s) this PR fixes:

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

[googs1025]

@lowang-bh @Monokaix /PTAL thanks!

[lowang-bh]

/lgtm

[Monokaix]

/lgtm

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lowang-bh

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