[Bug]: ConnectionString parsing for AppInsights - DAB CLI

What happened?

A bug happened!

Invalid connection string results in uncaught exception.

When starting using "dab start" the error message returned when connection string is invalid is not user-friendly. See stack trace. I originally thought the error was for db connection string until i saw stack trace originated from "Microsoft.ApplicationInsights"

Version

.11rc

What database are you using?

Azure SQL

What hosting model are you using?

Local (including CLI)

Which API approach are you accessing DAB through?

REST

Relevant log output

crit: Microsoft.AspNetCore.Hosting.Diagnostics[6]
      Application startup exception
      System.ArgumentException: There was an error parsing the Connection String: Input contains invalid delimiters and cannot be parsed. Expected example: 'key1=value1;key2=value2;key3=value3'.
       ---> System.ArgumentException: Input contains invalid delimiters and cannot be parsed. Expected example: 'key1=value1;key2=value2;key3=value3'.
         at Microsoft.ApplicationInsights.Extensibility.Implementation.ConfigString.ConfigStringParser.Parse(String configString)

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