Remove retain_resource_access_token_user_after_revoke FF

.../javascripts/pages/groups/settings/access_tokens/index.js

...avascripts/pages/projects/settings/access_tokens/index.js

app/controllers/concerns/access_tokens_actions.rb

app/services/personal_access_tokens/rotate_service.rb

app/services/resource_access_tokens/create_service.rb

app/services/resource_access_tokens/revoke_service.rb

app/views/groups/settings/access_tokens/index.html.haml

app/views/projects/settings/access_tokens/index.html.haml

...s/beta/retain_resource_access_token_user_after_revoke.yml

doc/user/project/settings/project_access_tokens.md

ee/spec/requests/admin/credentials_controller_spec.rb

spec/factories/personal_access_tokens.rb

spec/lib/authn/tokens/personal_access_token_spec.rb

spec/requests/api/resource_access_tokens_spec.rb

spec/services/group_access_tokens/rotate_service_spec.rb

spec/services/project_access_tokens/rotate_service_spec.rb

spec/services/resource_access_tokens/create_service_spec.rb

spec/services/resource_access_tokens/revoke_service_spec.rb

...shared_examples/features/access_tokens_shared_examples.rb

...ples/requests/access_tokens_controller_shared_examples.rb