fix ut failed in federatedresourcequota

[XiShanYongYe-Chang]

What type of PR is this?

/kind failing-test

What this PR does / why we need it:

An intermittent error was found on the master branch,

=== FAIL: pkg/webhook/federatedresourcequota TestValidatingAdmission_Handle/Handle_ExceedResourceLimits_ResourceLimitsExceeded (0.00s)
E0921 06:46:06.951602   28812 validating.go:55] [spec.overall[memory]: Invalid value: "5Gi": overall is less than assignments spec.overall[cpu]: Invalid value: "5": overall is less than assignments]
    validating_test.go:432: Handle() = {Type: Denied, Message: [spec.overall[memory]: Invalid value: "5Gi": overall is less than assignments, spec.overall[cpu]: Invalid value: "5": overall is less than assignments]}, want {Type: Denied, Message: spec.overall[cpu]: Invalid value: "5": overall is less than assignments, spec.overall[memory]: Invalid value: "5Gi": overall is less than assignments}
    --- FAIL: TestValidatingAdmission_Handle/Handle_ExceedResourceLimits_ResourceLimitsExceeded (0.00s)

=== FAIL: pkg/webhook/federatedresourcequota TestValidatingAdmission_Handle (0.00s)

related to the sorting of error messages, and it has been fixed.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[XiShanYongYe-Chang]

Hi @mohamedawnallah. can you help take a look? Thanks~
/cc @mohamedawnallah

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Hi @mohamedawnallah. can you help take a look? Thanks~
/cc @mohamedawnallah

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[mohamedawnallah]

Great catch @XiShanYongYe-Chang! LGTM!

[XiShanYongYe-Chang]

/assign @RainbowMango

[RainbowMango]

/approve
/lgtm

[karmada-bot]

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