Restrict pricelist price update from product page

[JustShah]

Restrict Price Edits for Price List Prices

This pull request introduces restrictions on editing or deleting prices that are associated with a price list from product tab. It adds localization, view updates, and backend checks to prevent modifications to prices that belong to price lists, ensuring better integrity in the pricing system.

Key Features:

1. Localization and View Updates for Price List Prices:

   • Added a new localization key for an error message indicating that a price belongs to a price list and cannot be edited or deleted.
   • Updated the master variant price table and the general price table of product tab in the admin interface:
     • Prevented editing and deleting of prices that belong to a price list.
     • Displayed a message indicating the associated price lists for prices that are part of a price list.
   • Added a hidden field is_pricelist_price to the price list item form to track whether a price belongs to a price list.

2. Price List Price Check for Variants and Prices:

   • Implemented check_pricelist_price method in the variant API and price admin controllers to prevent users from updating prices that are associated with a price list.
   • Ensured that the system enforces the restriction on editing prices that are part of a price list at both the backend and user interface levels.

3. New Attribute is_pricelist_price in Spree Price Model:

   • Added a boolean attribute is_pricelist_price to the Spree::Price model to identify whether a price has been created for a price list.
   • This attribute helps differentiate prices that are part of price lists from regular product prices, providing additional control and flexibility in managing pricing.

Benefits:

• Price Integrity: Prevents accidental modification or deletion of prices that are part of a price list, ensuring that the pricing structure remains intact.
• Improved User Interface: The admin interface now provides clear feedback when attempting to edit or delete prices associated with a price list, improving user experience and reducing errors.
• Backend Enforcement: The addition of backend checks ensures that users cannot bypass the restrictions when interacting with the API or admin controllers.
• Flexible Price Management: The is_pricelist_price attribute allows for easier identification and management of prices that belong to price lists.

[fthobe]

@JustShah add logic to link to pricelist

[fthobe]

@JustShah looks good and fine to me