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/container/set_test.go

@@ -4,6 +4,7 @@
 package container
 
 import (
+	"slices"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -29,6 +30,14 @@ func TestSet(t *testing.T) {
 	assert.True(t, s.Contains("key4"))
 	assert.True(t, s.Contains("key5"))
 
+	values := s.Values()
+	called := 0
+	for value := range s.Seq() {
+		called++
+		assert.True(t, slices.Contains(values, value))
+	}
+	assert.EqualValues(t, len(values), called)
+
 	s = SetOf("key6", "key7")
 	assert.False(t, s.Contains("key1"))
 	assert.True(t, s.Contains("key6"))