Remove legacy callback argument from .group in api.js
Summary
As dicussed in !25809 (comment 339145923):
our callback is pretty legacy, I suggest adding
callback = () => {}
toapi.js
instead and to have cleanApi.group(id)
request :)
I think we can remove the legacy callback argument.
Improvements
Remove callback
argument from 'group(id, callback)' in api.js
.
Risks
Low to none.
Involved components
This will also need to refactor ee/app/assets/javascripts/audit_logs/components/tokens/group_token.vue
once !25809 (merged) is merged.