slices: delegate to Go slices

[skitt]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This replaces strings/slices functions that have equivalents in Go’s slices package with calls to the latter.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

NONE

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[skitt]

Ah we’re still on Go 1.18.

[liggitt]

we can update the go version to the minimum go version required by the oldest supported kubernetes branch (currently 1.31, https://kubernetes.io/releases/#release-history, so go 1.22 - https://github.com/kubernetes/kubernetes/blob/release-1.31/go.mod)

once that includes the stdlib slices package, we can do this

[skitt]

once that includes the stdlib slices package, we can do this

Right, so once 1.31 reaches EOL at the end of October and we can bump to 1.23: https://github.com/kubernetes/kubernetes/blob/release-1.32/go.mod

[skitt]

Actually Go 1.21 has everything this needs…