Ensured that nested assertion scopes produce a nested context. So the statement

usingvarouterScope=newAssertionScope("outer");usingvarinnerScope=newAssertionScope("inner");

Results in a{context} as used inFailWith that containsouter/inner.

This should help#2597 produce a nicer message.

Also fixed an inconsistency in which one overload of the assertion scope constructor would not actually affectAssertionScope.Current.

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