[browser][MT] improve abort on web worker

[pavelsavara]

• replace mono_wasm_abort with Module.abort to be able to pass reason string
• register onAbort and onExit also on worker
• improve stack trace reporting across threads
• _emscripten_force_exit if the UI thread is spin-waiting
  • trigger it 3000ms after critical mono_wasm_trace_logger like g_assert
  • trigger it 3000ms after nativeAbort
• fix error formatting
• max delay for teardown_proxy_console 3000ms
• only print WASM EXIT on UI thread
• rename cancelThreads to postCancelThreads
• move mono_wasm_install_js_worker_interop and mono_wasm_uninstall_js_worker_interop to file worker-interop.ts
• nativeAbort now also calls terminateAllThreads on UI thread
• report navigator.userAgent during test-main.js to be able to validate browser version

Contributes to #98309
Contributes to #99888
Contributes to #100249

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[pavelsavara]

Part of the failures are #100275
I also filed new #100831 which is uncovered by this PR