Add Rails 8 authentication generator #2811
                
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Fixes #2810.
Problem
When running Rails 8's
bin/rails generate authentication, generation ends with with the following error:error rspec [not found].This is because the Rails
AuthenticationGeneratorcontainshook_for :test_framework, which callsrspec-rails, but it errors out sincerspec-railsdoes not have an authentication generator.Solution
Add authentication generator that creates a user test and possibly a fixture, similarly to Rails'
TestUnit::Generators::AuthenticationGenerator. The fixture is basically the same as the Rails one except that it has a comment similar torspec-rails' model fixture.An alternative solution could be to somehow disable the authentication generator for
rspec-railsso nothing is generated while not having any errors. This might be a viable option if Rails adds more generators in the future and playing catch-up is undesired.