RBAC: Remove builtin role code (#53767)

* remove rbacBuiltInRoleAssignmentEnabled from frontendsettings

* RBAC: Remove RBACBuiltInRoleAssignmentEnabled

* RBAC: Remove code for builtin role

* RolePicker: Remove unused prop

* RolePicker: Rename builtinRole to basicRole

* RolePicker: Rename onBuiltinRoleChange to onBasicRoleChange

* RolePicker: Rename properties

pkg/setting/setting.go

@@ -451,9 +451,6 @@ type Cfg struct {
 	// Access Control
 	RBACEnabled         bool
 	RBACPermissionCache bool
-	// Undocumented option as a backup in case removing builtin-role assignment
-	// fails
-	RBACBuiltInRoleAssignmentEnabled bool
 }
 
 type CommandLineArgs struct {
@@ -1356,7 +1353,6 @@ func readAccessControlSettings(iniFile *ini.File, cfg *Cfg) {
 	rbac := iniFile.Section("rbac")
 	cfg.RBACEnabled = rbac.Key("enabled").MustBool(true)
 	cfg.RBACPermissionCache = rbac.Key("permission_cache").MustBool(true)
-	cfg.RBACBuiltInRoleAssignmentEnabled = rbac.Key("builtin_role_assignment_enabled").MustBool(false)
 }
 
 func readUserSettings(iniFile *ini.File, cfg *Cfg) error {