[SYCL][Graph] Support handler-based restricted host task with native recording

[mmichel11]

Follow-up to #22143.

This PR adds event signaling and waiting to the native graph recording of host tasks. This enables the handler based restricted host task to signal a UR backed SYCL event and respect wait event dependencies. Special handling is added to enable graph forks.

[Copilot]

Pull request overview

This PR extends SYCL Graph native recording support for handler-based restricted host tasks by adding UR event signaling and honoring wait-event dependencies, including fork/join cases where a non-recording queue joins an in-progress capture via dependencies.

Changes:

• Add native-recording host-task event signaling/waiting support in handler::finalize() for CGType::NativeHostTask.
• Enhance native-graph discovery to support fork/join scenarios by considering dependency events’ worker queues.
• Add new end-to-end tests covering fork/join event dependencies for restricted host tasks in native recording mode.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
sycl/source/handler.cpp	Adds native-recorded host-task UR wait/signal event handling and graph lookup via dependency events.
sycl/test-e2e/Graph/RecordReplay/Inputs/enqueue_func_host_task_event.cpp	New shared test logic for handler-based restricted host task fork/join with event dependencies.
sycl/test-e2e/Graph/RecordReplay/NativeRecording/enqueue_func_host_task_event.cpp	Native-recording wrapper test enabling the new behavior under the native recording configuration.