Fix #3804, Fix #5776

* Add feature test that tests behaviour of profile name and bio

* Fix rubocop style errors in Login Spec.

* DRY log_in_spec by reusing the stories helper

Co-authored-by: Eugen Rochko <eugen@zeonfederated.com>

* Introduce domains method to Account relation

Account had followers_domains method, which was excessively specific.
Let relation of Account have domains method instead.

* Move follow_mapping in Account to AccountInteractions

* Introduce shared examples for AccountAvatar inclusion

* Cover Account more