Remove needless setup from `InfoTest`
Remove needless setup from `InfoTest`

The `abstract_unit` loads `rails/all`. Therefore, `Rails` is definitely defined.
Also, since `Info` is autoloaded, do not need to explicitly load the file.
https://github.com/rails/rails/blob/3ede539357acc91e377611cea9dd5f30678e7b2a/railties/lib/rails.rb#L29

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