* connected diagnostic service to task status center

* PR feedback updated some variable name and string

* fixed test break.

task status center and service provider doesn't exist in unit test

* made GetProject and GetDocument to have same behavior on given ProjectId/DocumentId

* addressed PR feedback

* forgot to remove optional

* moved diagnostic progress reporter out of error list and made its own thing

* removed unnecessary service provider

* removed ?. and adjust ordering

* removed comment

* removed debug only info

* address PR feedbacks

* update on VoidResult

* removed blank line

* more feedbacks