Adds #17619 checkouts of an asset to 'All Assigned Email' of a user

[Godmartinz]

This adds all Assets/Components/Accessories/Licenses assigned to Asset_X, to be displayed for the User of Asset_X in the All Assigned To User Email notification.
Adds #17619

Asset 534683216 has one of each checked out to it.

And the User has Asset 534683216, one license, and one accessory checked out for correlation:

A total of seven items are now accounted for in the All Assigned Email:

[swift2512]

@Godmartinz could Custom fields be added to this 'Print all assigned'/'Email List of All Assigned' lists?
Probably, since day one 'Print all assigned'/'Email List of All Assigned' offers less columns than are in 'Your Profile > Accept Items' View. It would be great to have 'Custom Fields'.

[snipe]

@swift2512 there is a separate PR for that. #17426

[snipe]

I think this could get a little confusing though, no? I think we'd probably want to break those out into different sections within the email. Since a component can't be assigned to a user, the report isn't exactly correct the way it is.

[snipe]

I think we should break these out into their own sections in the emailed report - and whichever way we do it, it should be consistent with the way it appears in the "print all assigned" page.