dra scheduler: fix data race in unit test

[pohly]

What type of PR is this?

/kind bug
/kind failing-test

What this PR does / why we need it:

Clearing some irrelevant fields in objects caused a flaky data race alert because in some cases, the objects were pointers into a shared cache. A better solution is to treat the objects as read-only and ignore the irrelevant fields.

Which issue(s) this PR fixes:

Fixes #124379

Special notes for your reviewer:

First appeared this week after merging #123938. No need to backport.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

This issue is currently awaiting triage.

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[klueska]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: aac92375b3716b16f60e9045c3131064ae587999

[pohly]

/priority important-soon
/assign @kerthcet

For approval.

[kerthcet]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kerthcet, pohly

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