UTs for `commmandoverrider.go`

[1Shubham7]

What type of PR is this?

/kind test

What this PR does / why we need it:

I have added unit tests for the cloud/pkg/controllermanager/edgeapplication/overridemanager/commandoverrider.go

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[1Shubham7]

@WillardHu please review this as well : )

[WillardHu]

/approve

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: WillardHu

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