feat: Cloud Adapter for streaming tests

[joshgummersall]

• Moves streaming e2e tree into the testing directory
• Code formatting
• Replaces BotFrameworkAdapter with CloudAdapter

#minor

[coveralls]

Pull Request Test Coverage Report for Build 994166019

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.003%) to 84.329%

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Totals
Change from base Build 992195184:	-0.003%
Covered Lines:	19629
Relevant Lines:	22079

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💛 - Coveralls

[joshgummersall]

Note: once this lands I'll reconfigure the ADO pipeline(s) to point to the new location.

[mdrichardson]

Maybe either DIRECT_LINE_SECRET?.substr(-3) or do an argument check (if not already done elsewhere) prior to this step? There's a couple of these calls in this function. Although it looks like it'll send a 500 prior to this step if it's empty. I'm not sure how clear the err.message is for an empty token, though.

Upon further inspection, it might be good to throw in generateDirectlineToken()

[joshgummersall]

I wanted to keep this change scoped to just Cloud Adapter. As this is code for CI, I think it's okay to expect the environment is set up correctly.

[mdrichardson]

Approved, pending the one unresolved comment I left.