Use slices package from the stdlib when possible (#5360)

* Use slices from the stdlib when possible

* Add some unit tests

* More small tweaks + add benchmark func

pkg/sqlite/scene_marker_test.go

@@ -5,11 +5,11 @@ package sqlite_test
 
 import (
 	"context"
+	"slices"
 	"strconv"
 	"testing"
 
 	"github.com/stashapp/stash/pkg/models"
-	"github.com/stashapp/stash/pkg/sliceutil"
 	"github.com/stashapp/stash/pkg/sliceutil/stringslice"
 	"github.com/stretchr/testify/assert"
 )
@@ -133,7 +133,7 @@ func verifyIDs(t *testing.T, modifier models.CriterionModifier, values []int, re
 	case models.CriterionModifierNotEquals:
 		foundAll := true
 		for _, v := range values {
-			if !sliceutil.Contains(results, v) {
+			if !slices.Contains(results, v) {
 				foundAll = false
 				break
 			}