[wasm][debugger] Tests randomly fail with `The tasks argument included a null value. (Parameter 'tasks')`

[radical]

Debugger tests randomly fail on the CI with this:

DevToolsProxy::Run: Exception System.ArgumentException: The tasks argument included a null value. (Parameter 'tasks')
    at System.Threading.Tasks.Task.WhenAny(Task[] tasks)
    at Microsoft.WebAssembly.Diagnostics.DevToolsProxy.Run(Uri browserUri, WebSocket ideSocket) in /_/src/mono/wasm/debugger/BrowserDebugProxy/DevToolsProxy.cs:line 269

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Issue Details

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Author:	radical
Assignees:	-
Labels:	arch-wasm, area-Debugger-mono
Milestone:	-

[radical]

Should be fixed by #65752 .