docs: add TSDocs for cart line item pricing and merging utilities [automated]

[shahednasser]

Automated TSDoc Additions

This PR adds TSDoc comments to TypeScript source files changed in commit a4791af.

Added TSDoc comments for new and updated cart step and utility exports introduced in commit a4791af3b2.

• Added @since 2.18.1 and descriptions to the new getLineItemPricingQuantitiesStep, GetLineItemPricingQuantitiesStepInput, findMatchingLineItem, MatchableLineItem, and lineItemFieldsForMerging exports.
• Added a missing TSDoc block for the GetLineItemActionsStepOutput interface in get-line-item-actions.ts.
• Existing TSDoc on addToCartWorkflow, updateLineItemInCartWorkflow, and other pre-existing symbols was left untouched.

Triggered by: fix(core-flows): re-price merged cart line items and hydrate compare_at on update (#16211)

Files updated:

• packages/core/core-flows/src/cart/steps/get-line-item-actions.ts
• packages/core/core-flows/src/cart/steps/get-line-item-pricing-quantities.ts
• packages/core/core-flows/src/cart/steps/index.ts
• packages/core/core-flows/src/cart/utils/find-matching-line-item.ts
• packages/core/core-flows/src/cart/workflows/add-to-cart.ts
• packages/core/core-flows/src/cart/workflows/update-line-item-in-cart.ts

Review carefully before merging. Claude may have missed context or used incorrect descriptions.

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