Generate deterministic fixture for users_select/index_spec
## Description See [this comment](https://gitlab.com/gitlab-org/gitlab/-/issues/327805#note_552058688) for context: > One contributing factor to this is that this fixture is very different in CE and EE > > https://gitlab.com/gitlab-org/gitlab/blob/4735c99b1fdd7e413c288497eec9c45fb4ba9012/spec/frontend/fixtures/merge_requests.rb#L65 > > This is surprising to me. I thought licensed features were false by default in our spec environment :thinking: ## Investigation Since there's some other tests using the old `merge_request_for_current_user.html` fixture, it's probably safest to try to add a brand new one just for that part of the view we are interested in.
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