[iOS] Fix hooks API not cancelling JS Responder

[j-piasecki]

Description

Fixes #4258

JS-responder cancellation relies on RNRootViewGestureRecognizer being installed on the surface view. The legacy path installs it in maybeBindHandler via registerViewWithGestureRecognizerAttachedIfNeeded, but the hook-API detector attached handlers straight to the registry and skipped that step, so activation could never cancel the JS responder.

This PR adds attachHandlerForDetectorWithTag:toView:withActionType:withHostDetector: on RNGestureHandlerManager which handles that.

Test plan

Tested on the issue reproducer

[Copilot]

Pull request overview

Fixes iOS hook-API GestureDetector activation not cancelling the JS responder by ensuring RNRootViewGestureRecognizer gets installed on the appropriate surface/touch-handler view when detectors attach handlers (matching the legacy attach path behavior).

Changes:

• Added attachHandlerForDetectorWithTag:toView:withActionType:withHostDetector: to RNGestureHandlerManager to attach a handler and register the surface view for JS-responder cancellation.
• Updated RNGestureHandlerDetector to route detector-driven handler attachment through the new manager method (instead of attaching directly via the registry).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/react-native-gesture-handler/apple/RNGestureHandlerManager.mm	Adds a detector-specific attach helper that also installs the root gesture recognizer via registerViewWithGestureRecognizerAttachedIfNeeded:.
packages/react-native-gesture-handler/apple/RNGestureHandlerManager.h	Exposes the new manager attach helper for use by the detector.
packages/react-native-gesture-handler/apple/RNGestureHandlerDetector.mm	Switches detector attachment sites to use the new manager helper so JS responder cancellation can occur.

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