refactor: simplify namespace exclusion logic

Replace the manual loop for checking excluded namespaces with 
the built-in slices.Contains function. This change enhances 
the readability and efficiency of the code, while also 
allowing for wildcard matching in exclusion.

main.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"flag"
 	"log"
+	"slices"
 	"strings"
 	"time"
 
@@ -91,12 +92,7 @@ func main() {
 }
 
 func nsExcluded(name string, excludedNS []string) bool {
-	for _, ns := range excludedNS {
-		if name == ns {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(excludedNS, name) || slices.Contains(excludedNS, "*")
 }
 
 func parseArgs() args {