fix: cache util fixes

[hajnalmt]

The checking functions in the cache utils has ambiguous logging entries:
I0925 07:48:34.403937 5756 util.go:79] schedulerPodName is responsible to Node k3d-volcano-dev-agent-2

Since in single scheduler scenarios the schedulerPodname is not populated. These entries are intimidating, because:

• It's not clear that we are in caching territory so no things to be afraid.
• Looks weird that there is an empty string after schedulerPodName.

Furthermore, if it's empty the consistent hash circle is not needed to be checked.

What type of PR is this?

/kind bug

What this PR does / why we need it:

Minor improvement in caching.
Adding this check is preventing the responsibility functions to go on.

Which issue(s) this PR fixes:

Fixes #4646

Special notes for your reviewer:

The reason why it's empty is laying in the multi-scheduler implementation based on consistency hashes:
https://github.com/volcano-sh/volcano/blob/master/docs/design/deploy-multi-volcano-schedulers-without-using-selector.md
Implemented in this PR:
#1795
We get the env vars out in cache.go:
https://github.com/volcano-sh/volcano/blob/master/pkg/scheduler/cache/cache.go#L542
But it is an empty string since it's not specified:
https://github.com/volcano-sh/volcano/blob/master/pkg/scheduler/cache/util.go#L106
This is most of the cases as we don't support this config through the helm chart yet. See:
#4645

Does this PR introduce a user-facing change?

NONE

[volcano-sh-bot]

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[gemini-code-assist]

Summary of Changes

Hello @hajnalmt, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the cache utility functions by improving logging and optimizing logic for single-scheduler environments. It resolves misleading log messages that appear when the schedulerPodName is not set, and prevents redundant consistent hashing checks in such scenarios, ensuring that the scheduler correctly identifies its responsibility for pods, nodes, and pod groups without unnecessary overhead.

Highlights

• Logging Clarity: Addresses ambiguous logging entries in cache util functions that appear when schedulerPodName is not populated, which can be misleading in single-scheduler setups. New log messages clarify that these are not multi-scheduler scenarios.
• Performance Optimization: Prevents unnecessary consistent hash circle checks in responsibleForPod, responsibleForNode, and responsibleForPodGroup functions when mySchedulerPodName is empty, as these checks are only relevant for multi-scheduler scenarios.
• Conditional Logic: Introduces early exit conditions in responsibleForPod, responsibleForNode, and responsibleForPodGroup to return true immediately if mySchedulerPodName is not specified, indicating that the current scheduler is responsible in a single-scheduler context.

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[gemini-code-assist]

Code Review

This pull request correctly addresses the ambiguous logging in single-scheduler scenarios by adding checks for an empty schedulerPodName in the responsibleFor... utility functions. The changes are clear and prevent unnecessary consistent hash lookups. I've added one suggestion to refactor the duplicated logic into a helper function to improve code maintainability.

[hajnalmt]

/assign @Thor-wl

[hajnalmt]

/cc @JesseStutler
/cc @Monokaix