test(ui): move the user button type tests into __tests__

Author: alexcarpenter

…mosaic/user-button/user-button.test-d.ts …r-button/__tests__/user-button.test-d.tspackages/ui/src/mosaic/user-button/user-button.test-d.ts renamed to packages/ui/src/mosaic/user-button/__tests__/user-button.test-d.ts packages/ui/src/mosaic/user-button/user-button.test-d.ts renamed to packages/ui/src/mosaic/user-button/__tests__/user-button.test-d.ts

@@ -1,7 +1,7 @@
 import type { OrganizationResource, UserResource } from '@clerk/shared/types';
 import { describe, expectTypeOf, test } from 'vitest';
 
-import type { UserButtonProps } from '../index';
+import type { UserButtonProps } from '../../index';
 
 // The published surface of `@clerk/nextjs/experimental/mosaic`, imported the way a consumer gets it.
 // Object literals reach `accept` the same way JSX attributes reach the component, excess-property