DNS: Fix rrsetNameLength validation (#345)

* fix rrsetNameLength validation

* remove string length validation entirely

Co-authored-by: Diogo Ferrão <diogo.ferrao@freiheit.com>

---------

Co-authored-by: Diogo Ferrão <diogo.ferrao@freiheit.com>

Author: slm0n87

stackit/internal/services/dns/recordset/resource.go

@@ -149,7 +149,6 @@ func (r *recordSetResource) Schema(_ context.Context, _ resource.SchemaRequest,
 				Required:    true,
 				Validators: []validator.String{
 					stringvalidator.LengthAtLeast(1),
-					stringvalidator.LengthAtMost(63),
 				},
 			},
 			"fqdn": schema.StringAttribute{