featuregate: ensure deterministic ordering in SetFeatureGatesDuringTest

[itzPranshul]

What type of PR is this?

/kind bug
/kind flake

What this PR does / why we need it:

SetFeatureGatesDuringTest currently iterates over a map of feature overrides. Since Go map iteration is randomized, the order of application is non-deterministic. This causes flakiness when broad gates (e.g., AllBeta) and specific features are set in the same map, as the broad gate may randomly overwrite specific settings.

This PR sorts feature keys alphabetically before iteration to ensure a stable, predictable test state.

Which issue(s) this PR is related to:

fixes a part of #134009

NONE

[k8s-ci-robot]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: itzPranshul
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[dims]

needs a test case too no?

[itzPranshul]

Done. I have added a regression test, PTAL