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Why is this an issue?
After an awaited Task has executed, you can continue execution in the original, calling thread or any arbitrary thread.
Unless the rest of the code needs the context from which the Task was spawned, Task.ConfigureAwait(false) should be used to
keep execution in the Task thread to avoid the need for context switching and the possibility of deadlocks.
This rule raises an issue when code in a class library targeting .Net Framework awaits a Task and continues execution in
the original calling thread.
The rule does not raise for .Net Core libraries as there is no SynchronizationContext in .Net Core.
Noncompliant code example
var response = await httpClient.GetAsync(url);  // Noncompliant

Compliant solution
var response = await httpClient.GetAsync(url).ConfigureAwait(false);