Update feature_flags.go

use maps and slices instead of explicit for loop

Author: DMyachin

internal/configfile/feature_flags.go

@@ -1,5 +1,10 @@
 package configfile
 
+import (
+	"maps"
+	"slices"
+)
+
 type flagIota int
 
 const (
@@ -53,21 +58,12 @@ var knownFlags = map[flagIota]string{
 
 // isFeatureFlagKnown verifies that we understand a feature flag.
 func isFeatureFlagKnown(flag string) bool {
-	for _, knownFlag := range knownFlags {
-		if knownFlag == flag {
-			return true
-		}
-	}
-	return false
+	collection := slices.Collect(maps.Values(knownFlags))
+	return slices.Contains(collection, flag)
 }
 
 // IsFeatureFlagSet returns true if the feature flag "flagWant" is enabled.
 func (cf *ConfFile) IsFeatureFlagSet(flagWant flagIota) bool {
 	flagString := knownFlags[flagWant]
-	for _, flag := range cf.FeatureFlags {
-		if flag == flagString {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(cf.FeatureFlags, flagString)
 }