Add custom_button_events subcollection for users, tenants and groups

[skateman]

As we discussed with @Hyperkid123 and @h-kataria, the new API-driven react/redux-based RBAC UI should include the custom button events via the API instead of using nested resources.

@miq-bot add_label enhancement, gaprindashvili/no
cc @Hyperkid123 you can start working with this in your PR

https://bugzilla.redhat.com/show_bug.cgi?id=1634053

[h-kataria]

@skateman if a feature is marked as a hidden feature it is not displayed in the features tree but role_allows call returns true for the hidden features, in this case since we are not making role_allows call it should work.

[skateman]

@h-kataria thanks, that's great, then we would need to specify somehow that this feature is for admins and super admins only. Is there a way to do so?

[skateman]

@miq-bot assign @abellotti

[bdunne]

Do we also need subresource_actions for get?

[skateman]

I'm not completely familiar what that would allow us, can you please help me?

[bdunne]

IIUC, subcollection_actions get allows get /api/users/:id/custom_button_events, but you would need subresource_actions get to allow get /api/users/:id/custom_button_events/:id. Is that correct @abellotti?

[skateman]

@bdunne we don't need those, this feature is an admin-only debug thing

[miq-bot]

Checked commit skateman@80e6115 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
7 files checked, 0 offenses detected
Everything looks fine. 🏆

[Hyperkid123]

@bdunne what is the progress with this PR?

[skateman]

@Hyperkid123 unleash the monster react