Allow a 'quiet` flag for CI builds using scripts

[ryanisgrig]

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The BF Solutions builds make use of deployment scripts that utilize botdispatch, luis-apis, and botframework-cli. In order to run successfully we have to set build task settings as both:

• ErrorActionPreference: Continue
• Continue on error: Enabled

Without these the task fails almost immediately due to the formatting of output in the command prompt

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Add a quiet flag so that the builds can correctly say "stop when there is an error" and only stop in that case.

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Additional context
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• When the settings are enabled to continue on error, the script runs correctly:
  

• When the settings are enabled to stop on error, the script breaks almost immediately:
  

[enhancement]

[LeeParrishMSFT]

Closing for inactivity.