[iOS] Refactor some logic around tap gesture handling when VKCImageAnalysisInteraction is active

[whsieh]

555e4e3

[iOS] Refactor some logic around tap gesture handling when VKCImageAnalysisInteraction is active
https://bugs.webkit.org/show_bug.cgi?id=240891
rdar://93808100

Reviewed by Aditya Keerthi.

Currently, when handling a single tap in WKContentView, we check whether or not the tap occurred
over the Live Text button in the `VKCImageAnalysisInteraction`; if so, we manually toggle Live Text
interaction highlight state. This special treatment exists (instead of simply relying on the
UIButton's tap gesture) because `WKContentView` already has its own synthetic click gesture which
conflicts with the UIButton's tap gesture; without this logic, taps on the analysis button would be
completely ignored.

While this works for the Live Text button, it doesn't work for other actionable buttons in the image
analysis interaction. To address this, we install a `UIButtonConfigurationUpdateHandler` on the
image analysis interaction just to collect the set of `UIButton`s that are owned by the interaction.
When tapping on the content view, if we hit one of these VisionKitCore-owned buttons, then invoke
the button action on its behalf.

* Source/WebKit/UIProcess/ios/WKContentViewInteraction.h:
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm:
(-[WKContentView _singleTapIdentified:]):

Also, pull this VisionKit interception logic out into a new helper method below, named
`-_handleTapOverImageAnalysisInteractionButton:`. This returns whether or not the tap was handled by
VisionKit (in which case we avoid treating this as a synthetic click on the page).

(-[WKContentView _handleTapOverImageAnalysisInteractionButton:]):
(-[WKContentView installImageAnalysisInteraction:]):
(-[WKContentView uninstallImageAnalysisInteraction]):

Canonical link: https://commits.webkit.org/250968@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294815 268f45cc-cd09-0410-ab3c-d52691b4dbfc

[whsieh]

Thanks for the review!

[webkit-early-warning-system]

Committed r294815 (250968@main): https://commits.webkit.org/250968@main

Reviewed commits have been landed. Closing PR #994 and removing active labels.