Replace sort functions with slices equivalents

[RTann]

go1.21 introduced the slices package which offers nice utility functions related to slices.

It comes with sorting functions which we should use instead of the older, sort package for slices. The documentation for go1.21 for these functions suggests using the slices package for better efficiency and ergonomics. In go1.22, some of the implementations were even replaced with the slices equivalents.

[RTann]

#10965 gets this started, but it does not cover the following:

• sort.IsSorted
• sort.Slice
• sort.SliceStable
• sort.Sort
• sort.Stable