Add properties to debugEcho to validate these are added to Brokers

[DazWilkin]

Is your feature request related to a problem? Please describe.

Add properties to debugEcho (and update the end-to-end test) to validate that the properties are configured in a broker's envvars.

Is your feature request related to a way you would like Akri extended? Please describe.

As above.

Promotes debugEcho as a useful debugging tool that utilizes feature set of Agent, discovery and Brokers.

Describe alternatives you've considered

Manually debugging is more challenging without an ideal|exemplar solution.

Additional context

See: #177