refactor: remove unused pointer conversion and simplify TTL handling

Author: jojomo96

internal/repository/rrset_repository.go

@@ -91,7 +91,7 @@ func (r *rrSetRepository) CreateRRSet(
 			}
 		}
 	}
-	ttl := int32(rrSet.Ttl)
+	ttl := rrSet.Ttl
 	payload := stackitdnsclient.CreateRecordSetPayload{
 		Comment: rrSet.Comment,
 		Name:    rrSet.Name,
@@ -117,7 +117,7 @@ func (r *rrSetRepository) UpdateRRSet(
 			Content: record.Content,
 		}
 	}
-	ttl := int32(rrSet.Ttl)
+	ttl := rrSet.Ttl
 	payload := stackitdnsclient.PartialUpdateRecordSetPayload{
 		Comment: rrSet.Comment,
 		Name:    &rrSet.Name,

internal/resolver/resolver_test.go

@@ -691,10 +691,6 @@ func (s *cleanSuite) TestCleanUp_KeyNotFound_DoesNothing() {
 	s.NoError(err)
 }
 
-func toPtr(str string) *string {
-	return &str
-}
-
 func matchedBy[T any](fn func(T) bool) gomock.Matcher {
 	return matcher[T]{fn}
 }