[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

```Text

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)
```

### Code of Conduct

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