Make dotnet-watch tests TFM agnostic

[am11]

next thing to unblock #43015

�[m�[37m      'dotnet watch ⚠ [WatchHotReloadApp (net9.0)] Exception from 'System.Action`1[System.Type[]]': System.InvalidOperationException: Bug!' not found in:
...
37m      'dotnet watch ⚠ [WatchHotReloadApp (net10.0)] Exception from 'System.Action`1[System.Type[]]': System.InvalidOperationException: Bug!'
�[m�[37m      '   at AppUpdateHandler.ClearCache(Type[] types)'

[ViktorHofer]

This works. Personally, I would have passed the watcher TFM in as an assembly attribute or a runtimeconfig entry to assert on the exact TFM but this way is fine.

Thank you!

[am11]

Lets rerun the failed legs. (one timed out, other one failed to delete a directory)