Add new Testing library to Code Coverage Metrics

[cleemullins]

Add the new .Testing DLL to the list of projects against which Code Coverage is tested.

[coveralls]

Pull Request Test Coverage Report for Build 65044

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.6%) to 71.687%

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Totals
Change from base Build 64810:	0.6%
Covered Lines:	4512
Relevant Lines:	6294

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💛 - Coveralls

[fuselabs]

✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.Luis.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.AI.QnA.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.ApplicationInsights.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Azure.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.Dialogs.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Builder.TemplateManager.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Configuration.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Connector.dll
✔️ No Binary Compatibility issues for Microsoft.Bot.Schema.dll

[cleemullins]

Looks like Code Coverage is now being picked up for the new Testing library.