[DRE-maint] Bug#962259: Creating Webhooks fails and returns error 500

[Antoine Le Gonidec]

I think I found another issue that has the same source than the one reported here.

When trying to enable 2-factor authentication on a user account:

Started GET "/profile/two_factor_auth" for xxxx:xxxx:xxxx:xxxx:xxxx at 2020-08-08 22:28:29 +0200
Processing by Profiles::TwoFactorAuthsController#show as HTML
Completed 500 Internal Server Error in 419ms (ActiveRecord: 18.7ms | Elasticsearch: 0.0ms | Allocations: 113618)
  
NoMethodError (undefined method `set_attribute_was' for #<User id:1 @xxxxx>
Did you mean?  custom_attributes):
  
app/controllers/profiles/two_factor_auths_controller.rb:8:in `show'
app/controllers/application_controller.rb:497:in `set_current_admin'
lib/gitlab/session.rb:11:in `with_session'
app/controllers/application_controller.rb:488:in `set_session_storage'
lib/gitlab/i18n.rb:55:in `with_locale'
lib/gitlab/i18n.rb:61:in `with_user_locale'
app/controllers/application_controller.rb:482:in `set_locale'
lib/gitlab/error_tracking.rb:51:in `with_context'
app/controllers/application_controller.rb:547:in `sentry_context'
app/controllers/application_controller.rb:475:in `block in set_current_context'
lib/gitlab/application_context.rb:52:in `block in use'
lib/gitlab/application_context.rb:52:in `use'
lib/gitlab/application_context.rb:20:in `with_context'
app/controllers/application_controller.rb:468:in `set_current_context'
lib/gitlab/request_profiler/middleware.rb:17:in `call'
lib/gitlab/middleware/go.rb:20:in `call'
lib/gitlab/etag_caching/middleware.rb:13:in `call'
lib/gitlab/middleware/multipart.rb:125:in `call'
lib/gitlab/middleware/read_only/controller.rb:51:in `call'
lib/gitlab/middleware/read_only.rb:18:in `call'
lib/gitlab/middleware/same_site_cookies.rb:27:in `call'
lib/gitlab/middleware/basic_health_check.rb:25:in `call'
lib/gitlab/middleware/handle_ip_spoof_attack_error.rb:25:in `call'
lib/gitlab/middleware/request_context.rb:23:in `call'
config/initializers/fix_local_cache_middleware.rb:9:in `call'
lib/gitlab/metrics/requests_rack_middleware.rb:60:in `call'
lib/gitlab/middleware/release_env.rb:12:in `call'

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