Fix bulk checkout to users, assets, and locations

[uberbrady]

This fixes bulk checkout, I think?

I was able to checkout two assets each to a user, a location, and another asset.

One complication here is that I have some of these changes tied up with some other changes that I'm working on. But bulk edit is broken now, and we need to fix it, so I've tried to carve this piece off from that.

We'll probably want to do a quick smoke test to make sure these changes aren't secretly relying on some other changes that I have in my tree.

[what-the-diff]

PR Summary

• Incorporated a new field in bulk-checkout interface
  A new field, 'asset_selector_div_id', is introduced to the bulk-checkout interface in order to increase its efficiency. Earlier the value 'assets_to_checkout_div' wasn't present, but it's now included to improve the functionality of the interface.

• Enhanced asset selection feature in bulk-checkout interface
  The 'asset_ids' variable has been incorporated in the bulk-checkout interface. Now, it's possible to populate the selected assets using previously inputted data. This enhances the overall user experience when selecting assets.

• Enhanced consistency through modification in the asset-select feature
  The asset-select feature has been updated, it now uses 'asset_selector_div_id' rather than the hardcoded 'assigned_asset' for the div ID. This leads to more consistent behavior and decreases dependence on hardcoded values enhancing system stability.

• Improved asset-select dropdown usability
  The asset-select dropdown now includes options for pre-selected asset selections if 'asset_ids' is provided. This improves the usability of the asset-select dropdown, making it easier and quicker for users to make selections.