Set qty mutators

[snipe]

This should hopefully solve a user error issue where the qty column is not set or is null in the importer. It just checks that $value (in this case qty) is not null, and if it is, it sets it to 0.

This should fix RB-16959/SC-20167.

[shortcut-integration]

This pull request has been linked to Shortcut Story #20167: Illuminate\Database\QueryException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'qty' cannot be null (SQL: insert into components (category_id, name, notes, order_number, purchase_cost, purchase_date, qty, serial, `updat.

[what-the-diff]

PR Summary

• Introduction of setQtyAttribute function in three models
  A new function called setQtyAttribute has been introduced in the Accessory.php, Component.php, and Consumable.php models. This function is designed to set up a quantity or 'qty' attribute, especially when no value is provided. It ensures the quantity doesn't remain undefined by assigning a default value of 0. This will help maintain the consistency and integrity of the data stored in these models.

[snipe]

@bzeus I'd love to have you hammer on this when the holiday break is over to test it thoroughly. <3

[marcusmoore]

Did some testing locally and it looks good to me 👍🏾