* Refactor `StorageMenu` modals to replace deprecated patterns
* add test for `DeleteBucketModal` and update test setup
Note: Because this component uses `useParams`, it's necessary to have the dynamic route segment passed to `next-router-mock`'s `createDynamicRouteParser`. In order not to have to manually list all of these as the application grows, I added a glob utility that uses the `pages/` directory to automatically generate an array of dynamic route paths in this case.
* add test for `EmptyBucketModal`
* add test for `EditBucketModal` and add `isNonNullable` utility function
* add test for `CreateBucketModal`
* implement requested changes
* implement visual fixes
