refactor: Simplify and modernize loops (#1522)

* refactor: Simplify loops

* refactor: Modernize loops using range over int

---------

Co-authored-by: TwiN <twin@linux.com>

config/endpoint/result.go

@@ -1,6 +1,7 @@
 package endpoint
 
 import (
+	"slices"
 	"time"
 )
 
@@ -66,11 +67,7 @@ type Result struct {
 // AddError adds an error to the result's list of errors.
 // It also ensures that there are no duplicates.
 func (r *Result) AddError(error string) {
-	for _, resultError := range r.Errors {
-		if resultError == error {
-			// If the error already exists, don't add it
-			return
-		}
+	if !slices.Contains(r.Errors, error) {
+		r.Errors = append(r.Errors, error+"")
 	}
-	r.Errors = append(r.Errors, error+"")
 }