Allow product association types to be customised

[alecritson]

PR to allow product association types to be customised.

• Deprecates the use of constants like UP_SELL on the model
• Introduces a new enum to handle association types
• Allow the enum to be replaced in config by developers.

[Copilot]

Pull request overview

This PR introduces a customizable enum-based system for product association types to replace hard-coded string constants, improving type safety and extensibility.

Key Changes:

• Deprecated the use of string constants (UP_SELL, CROSS_SELL, ALTERNATE) on the ProductAssociation model
• Introduced a new ProductAssociation enum with a ProvidesProductAssociationType interface
• Added configuration support to allow developers to replace the default enum with custom implementations

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/core/Unit/Models/ProductTest.php	Updated test cases to use the new enum instead of string constants
packages/core/src/Models/ProductAssociation.php	Added deprecation notices to constants and refactored scopes to use enum values
packages/core/src/Models/Product.php	Updated method signatures to type-hint ProvidesProductAssociationType instead of string
packages/core/src/Models/Contracts/ProductAssociation.php	Updated interface to accept enum type in scopeType method
packages/core/src/Models/Contracts/Product.php	Updated interface method signatures to use enum type-hint
packages/core/src/LunarServiceProvider.php	Added 'products' to the configuration files list
packages/core/src/Jobs/Products/Associations/Associate.php	Updated to use enum type and access enum value property
packages/core/src/Base/Enums/ProductAssociation.php	New enum implementing ProvidesProductAssociationType with label method
packages/core/src/Base/Enums/Concerns/ProvidesProductAssociationType.php	New interface defining the contract for product association type enums
packages/core/config/products.php	New configuration file for customizing the association types enum
packages/admin/src/Filament/Resources/ProductResource/Pages/ManageProductAssociations.php	Updated to use getTypes() method and enum-based formatting

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