Added assertNoReply to TestFlow/TestAdapter

[mdrichardson]

Fixes #1504

Description

Adds assertNoReply() as a method for TestFlows. This is a port from C#.

Testing

Also adds three additional tests to ensure:

• resolves if timeout hit while waiting for reply (this is done in C#, too)
• throws if an unexpected reply is received
• does not throw if no additional replies are received

[coveralls]

Pull Request Test Coverage Report for Build 122071

• 11 of 14 (78.57%) changed or added relevant lines in 1 file are covered.
• 9 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.07%) to 67.267%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/botbuilder-core/src/testAdapter.ts	11	14	78.57%

Files with Coverage Reduction	New Missed Lines	%
libraries/botframework-streaming/src/webSocket/webSocketTransport.ts	2	80.65%
libraries/botframework-streaming/src/webSocket/webSocketServer.ts	7	66.67%

Totals
Change from base Build 122058:	-0.07%
Covered Lines:	10345
Relevant Lines:	14551

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💛 - Coveralls

[cleemullins]

@Stevenic, @stevengum, can you please review?

[Stevenic]