Fixes #20999 - Reset env/cv for Activation Keys

[parthaa]

This commit allows one unset the environment and content view for
activation keys via the UI.

[theforeman-bot]

Issues: #20999

[parthaa]

Behavior

• Added the reset button 'X' next to the content view selection box to reset the CV for the activation key
• If you unselect an environment, it will reset the content view also.

[chris1984]

Looks good from the video

[jlsherrill]

shoudln't this unset the lifecycle environment too?

[parthaa]

@jlsherrill good point. Will look into it. One of the issues is that with the current environment selector resetting is harder than setting activationKey.environment = null.
@jlsherrill @Rohoover should I just get rid of it ?

[parthaa]

@jlsherrill @jturel @Rohoover after giving a valiant fight to vanquish the evil env selector I decided its easier to just reset the existing selector. So here is the new behavior. (Too many challenges with the tree design especially on the AK edit page.)

[parthaa]

In short reseting Content View will wipe out environment and Unchecking env will reset the content view

[jturel]

When content view has been cleared clicking into the dropdown will throw an error (Cannot read property id of null)

https://github.com/parthaa/katello/blob/d580e1f0517037cffa83815b24d5617722a74bb5/engines/bastion_katello/app/assets/javascripts/bastion_katello/activation-keys/details/activation-key-details-info.controller.js#L118

[parthaa]

When content view has been cleared clicking into the dropdown will throw an error (Cannot read property id of null)
Ok updated the behavior a little. Basically you cant select the content view unless you have an environment selected. Check the new version

[jturel]

Works nicely - APJ

Thanks!

[parthaa]

[test]

[parthaa]

[test katello]