breaking: remove deprecated logCheckout, logPurchase, and logRefund methods

[rmi22186]

Summary

• Removes deprecated mParticle.eCommerce.logCheckout(), mParticle.eCommerce.logPurchase(), and mParticle.eCommerce.logRefund() methods
• Removes corresponding internal implementations (logCheckoutEvent, logPurchaseEvent, logRefundEvent) from events layer
• Removes interface definitions, stub entries, snippet queue support, and the BadLogPurchase error constant
• Updates tests: removes 15 eCommerce tests and 2 native SDK tests that used deprecated methods, adds back 9 equivalent eCommerce tests and 2 native SDK tests using logProductAction

Migration

Users should migrate to mParticle.eCommerce.logProductAction() with the appropriate ProductActionType:

Deprecated Method	Replacement
logCheckout(step, option, attrs, customFlags)	logProductAction(ProductActionType.Checkout, product, attrs, customFlags, transactionAttributes)
logPurchase(transactionAttributes, product, clearCart, attrs, customFlags)	logProductAction(ProductActionType.Purchase, product, attrs, customFlags, transactionAttributes)
logRefund(transactionAttributes, product, clearCart, attrs, customFlags)	logProductAction(ProductActionType.Refund, product, attrs, customFlags, transactionAttributes)

Test plan

• Build passes (npm run build)
• All 1025 tests pass (npm test — Chrome Headless)
• No remaining references to removed methods in source or test files
• Verify no downstream SDK consumers depend on these methods

[sonarqubecloud]

Quality Gate failed

Failed conditions
45.8% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud

[cursor]

PR Summary

Medium Risk
This is a breaking public API removal for eCommerce logging, requiring downstream consumers to migrate to logProductAction and potentially impacting integrations that still call the deprecated methods.

Overview
Removes the deprecated eCommerce entry points logCheckout, logPurchase, and logRefund across the SDK surface area (public interfaces, instance manager proxy, snippet pre-init queue support, stubs, and error messaging).

Drops the corresponding internal event helpers (logCheckoutEvent, logPurchaseEvent, logRefundEvent) so checkout/purchase/refund tracking is now only performed via eCommerce.logProductAction with the appropriate ProductActionType.

Updates and reshapes tests to stop asserting deprecated-method behavior and instead validate equivalent purchase/refund/checkout behavior through logProductAction, including array product support, custom flags, and commerce event expansion expectations.

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