WIP [Phase 1 Kit Refactor] Fix #3707 add itemizable item, migrate kit line items (backup db before merge)

[jimmyli97]

Resolves #3707 Merges and closes #3750

Description

Merge #4585 and #4665 first BACKUP database before merging - includes migration in e866880 which changes kit line items to point to the item housing the kit as their Itemizable.

From original issue #3707:

• Adds itemizable module to base Item class
• Adds migration to change kit line items to point to the item housing the kit
• Update rspecs, views, KitCreateService, Allocation and Deallocation to point to the item housing the kit instead of the kit
• Move validations from kit to Item

Additional things done:

• Add validation to Item which ensures items which don't house kits don't have line items
• Disabled Itemizable specs for Item temporarily (it will be easier to do these when working on phase 2)
• Rename previous association Item.line_items to Item.contained_in_line_items to avoid name conflict
• Add testing a kit to storage_location total_value spec
• Add testing multiple line items when creating kit to kit system spec

Type of change

• Breaking change

How Has This Been Tested?

• passes test suite
• manual testing:
  • kits show up correctly Kits index
  • kit item shows up in Item index
  • kit creation, allocation, deallocation work
  • kit and kit item can be deactivated and reactivated (noticed a bug present on main branch where on reactivating kit item the corresponding kit doesn't get reactivated, but this should be fixed by phase 2 refactor)
  • kits affect inventory items correctly on Adjustment, Audit, Transfer
  • kits appear on Donations, Purchases, Distributions, Requests, Reports