chore: teach set module about iter.Seq (#6676)

- Add a new `Seq` function to the `Set` type, this returns an iterator over the values.
- Convert some users of the `Values` method to allow for more optimal code.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6676
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

modules/util/slice.go

@@ -4,7 +4,6 @@
 package util
 
 import (
-	"cmp"
 	"slices"
 	"strings"
 )
@@ -47,13 +46,6 @@ func SliceRemoveAll[T comparable](slice []T, target T) []T {
 	return slices.DeleteFunc(slice, func(t T) bool { return t == target })
 }
 
-// Sorted returns the sorted slice
-// Note: The parameter is sorted inline.
-func Sorted[S ~[]E, E cmp.Ordered](values S) S {
-	slices.Sort(values)
-	return values
-}
-
 // TODO: Replace with "maps.Values" once available, current it only in golang.org/x/exp/maps but not in standard library
 func ValuesOfMap[K comparable, V any](m map[K]V) []V {
 	values := make([]V, 0, len(m))