Deprecate strings/slices functions covered by stdlib slices

[tklauser]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

As suggested by @thockin in [1], deprecate the functions in the k8s.io/utils/strings/slices package that are already covered by generic functions in the Go standard library slices package. Also reimplement them in terms of slices functions.

[1] kubernetes/kubernetes#126715 (review)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Release note:

Deprecate k8s.io/utils/strings/slices functions covered by the Go standard libary slices package.

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[thockin]

super minor point. Is the `use [other] instead" syntax documented somewhere?

[tklauser]

super minor point. Is the `use [other] instead" syntax documented somewhere?

The syntax is documented at https://go.dev/doc/comment#doclinks

[thockin]

Cool.TIL. Thanks!

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: thockin, tklauser

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