[WCiOS17] Update trait update API for product flows

[RafaelKayumov]

WOOMOB-1303

Description

Fixes warnings for trait collection update deprecated API. Replaces traitCollectionDidChange(_ previousTraitCollection:) with new API calls in:

• AddProductImageCollectionViewCell
• ProductImageCollectionViewCell
• ProductImagesHeaderTableViewCell
• ProductsTabProductTableViewCell
• ProductFormViewController

Testing steps

Since the behaviour is not supposed to change - pls smoke the product list and product details screens for ui trait changes like light/dark appearance, accessibility font and contrast, orientation rotations.
For the following tests use Xcode debug and iOS simulator.

For AddProductImageCollectionViewCell

• Put breakpoint in applyContentBorderColorOnInterfaceStyleChange handler in AddProductImageCollectionViewCell.swift on line 40
• Navigate to Product details screen
• Toggle light/dark appearance in iOS Simulator -> Features -> Toggle Appearance
• Make sure the breakpoint is hit

For ProductImageCollectionViewCell

• Put breakpoint in applyContentBorderColorOnInterfaceStyleChange handler in ProductImageCollectionViewCell.swift on line 88
• Navigate to Product details screen
• Toggle light/dark appearance in iOS Simulator -> Features -> Toggle Appearance
• Make sure the breakpoint is hit

For ProductImagesHeaderTableViewCell

• Put breakpoint in registerForTraitChanges handler in ProductImagesHeaderTableViewCell.swift on line 174
• Toggle dark/light appearance
• Rotate device
• Toggle accessibility sizes
• Make sure the trait changes handler is triggered by the actions above and the breakpoint is hit.

For ProductsTabProductTableViewCell

• Put breakpoint in registerForTraitChanges handler in ProductsTabProductTableViewCell.swift on line 272
• Navigate to products list
• Toggle light/dark appearance in iOS Simulator -> Features -> Toggle Appearance
• Make sure the registerForTraitChanges handler is triggered and breakpoint is hit

For ProductFormViewController

• Put breakpoint in ProductFormViewController.swift on line 954
• Navigate to product details form
• Rotate the simulator to different orientations
• Make sure the registerForTraitChanges handler is triggered and breakpoint is hit.

Testing information

Tested in iOS 26 Simulator

---

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 23.3. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

Generated by 🚫 Danger

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr16140-358e207
	Version	23.2
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	358e207
	Installation URL	7i5srah4gb760

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[itsmeichigo]

LGTM 🚢 Tested with simulator iPhone 16 and iPad mini. All affected areas look good.