refactor(fs): simplify CopyContents

[Juneezee]

We can simplify the following code

dir, err := os.Open(dirname)
if err != nil {
	return err
}
defer dir.Close()

dirs, err := dir.Readdir(-1)

with just os.ReadDir(dirname)

Reference: https://pkg.go.dev/os#ReadDir

[openshift-ci]

Hi @Juneezee. Thanks for your PR.

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[coreydaley]

/test

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[coreydaley]

/test all

[coreydaley]

/lgtm

[coreydaley]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: coreydaley, Juneezee

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[openshift-ci]

@Juneezee: all tests passed!

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