Make it so that a webxr panic can be caught by the Servo/UWP panic handler

[paulrouget]

The panic described here #27270 is not caught by our panic handler (at least in simpleservo).

Before #186, when device was dropped here https://github.com/servo/webxr/blob/b170a86c081f762d201d3e870febc6e900ad365b/webxr-api/session.rs#L519 a panic would happen, but our catch_any_panic function would not catch it.

We want to catch such panics because we want eventually to be able to inform the user (see #27167).

[jdm]

I think we need to call panic::set_hook like we do for the winit port:

servo/ports/winit/main2.rs

Line 140 in fdbecc6

panic::set_hook(Box::new(|info| {

That will catch any panics that occur in threads that do not interact with the C API at all.

[paulrouget]

Fixed by #27438