Ensure client is initialised synchronously in bridgeless mode

[yousif-bugsnag]

Goal

The current code for detecting if the app is running in the remote debugger gives a false positive when running in Bridgeless New Architecture mode because global.nativeCallSyncHook is always undefined, meaning that the client is initialised asynchronously unnecessarily.

This PR updates the check to also check for global.RN$Bridgeless avoid a false positive on Bridgeless (based on React Native's internal code)

Testing

Tested manually in a 0.74 app

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	44.22 kB	13.52 kB
After	44.22 kB	13.52 kB
±	No change	No change

code coverage diff

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