do not require same sync context for compilation

[AndreiSingeorzan]

The deadlock is caused by:

1. Thread A uses the model item in whatever way, so it locks it
2. There's a Task.Run with VisualBasicDesignerHelper.CreatePrecompiledValueAsync().Result in WorkflowDesigner => Thread B
3. Thread B will eventually do FindVariable, which enumerates the model item, so tries to lock again => DEADLOCK

This PR will be followed by another PR in WorkflowDesigner, which does not use Task.Run anymore, for this compilation, so the flow will be:

1. Thread A locks the model item
2. Thread A does VisualBasicDesignerHelper.CreatePrecompiledValueAsync().Result
3. Thread A does FindVariable (it will be able to recursively acquire the lock)
4. Thread A does await GetAllDiagnosticsAsync(), which needs ConfigureAwait(false) (as the thread will be blocked at the earlier .Result now)

https://uipath.atlassian.net/browse/STUD-70986

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