Results controller: Notify listeners of changes when updating predicate and sort descriptors

[itsmeichigo]

Description

In #16339 @RafaelKayumov noticed that the results controller was not updated immediately when its predicate and sort descriptors are updated. The list is only updated after syncing finishes.

The reason is that when performFetch is triggered directly after changing predicate and sort descriptors, NSFetchedResultsController does NOT automatically call its delegate methods. The delegate methods are only triggered when the underlying Core Data store changes, not upon manual refetching.

This PR fixes the issue by manually triggering onDidChangeContent at the end of refreshFetchedObjects methods in GenericResultsController.

Test Steps

1. Comment out line 123 to prevent the resyncing of data in BookingListViewModel when switching filters.
2. Build and run the app.
3. Log in to a CIAB store with existing bookings.
4. Navigate to Bookings tab > All > Filters.
5. Select any filter option and select Show bookings.
6. Confirm that the booking list is reloaded immediately matching the new filters.
7. Repeat the test by tapping Sort and select a different sort option.
8. Confirm that the booking list is reloaded immediately matching the new sort option.

For beta testers, you can also disconnect the Internet connection on your devices and do similar tests as above using the order list or product list.

Screenshots

Simulator.Screen.Recording.-.iPhone.17.-.2025-11-13.at.09.58.37.mov

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• 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 23.7. 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.

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[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	pr16350-87e48a7
	Version	23.6
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	87e48a7
	Installation URL	19dua8fe4an68

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

[RafaelKayumov]

LGTM. Thx for the fix.