Autofix Rubocop RSpec/ImplicitSubject (#23721)

.rubocop_todo.yml

app/serializers/initial_state_serializer.rb

spec/controllers/admin/accounts_controller_spec.rb

spec/controllers/admin/instances_controller_spec.rb

spec/controllers/application_controller_spec.rb

spec/controllers/home_controller_spec.rb

spec/controllers/relationships_controller_spec.rb

spec/controllers/settings/featured_tags_controller_spec.rb

spec/controllers/settings/migrations_controller_spec.rb

spec/controllers/settings/sessions_controller_spec.rb

spec/features/log_in_spec.rb

spec/features/profile_spec.rb

spec/lib/emoji_formatter_spec.rb

spec/lib/entity_cache_spec.rb

spec/lib/html_aware_formatter_spec.rb

spec/lib/ostatus/tag_manager_spec.rb

spec/lib/plain_text_formatter_spec.rb

spec/lib/text_formatter_spec.rb

spec/models/concerns/account_interactions_spec.rb

spec/models/custom_emoji_spec.rb