use slices.SortFunc instead of other sorting funcs

[sivchari]

Currently, we use some both sort and slices package to sort the slice.
slices.SortFunc is more generic and runs faster.
Let'ts replace with slices.SortFunc.

/kind cleanup

[sivchari]

/triage accepted

[sbueringer]

I would keep using funcs like sort.Strings, but we can replace sort.Slice (basically I would only replace the funcs that have the godoc that slices. funcs would be better)

[Surya-7890]

Hi @sbueringer @sivchari , I noticed that there are several instances of sorting functions, that the godoc recommends alternatives to.

1. sort.SliceStable to slices.SortStableFunc
2. sort.Sort to slices.SortFunc
3. sort.Slice to slices.SortFunc

Please let me know if I am missing something. If I can proceed with this, I would be happy to open a PR. Thanks!

[sbueringer]

Thx! All good, feel free to open a PR

[sbueringer]

/assign @Surya-7890