Extend usage of automatic mocks where it's possible

[zaychenko-sergei]

We have a bunch different approaches to mocking system traits:

• we sometimes use mock macro in test modules
• we sometimes create reusable mocks in src/testing dirs

To unify it's proposed third approach via conditional automock macro. Benefits:

• no duplication of traits
• no extra files
• does not compile when not needed
• mocks are easy to find: e.g. if you have access to QueryService - you can use MockQueryService

Note that historically we've seen compilation issues when attempting to automock some of our traits.
Review the manually written mocks in the entire project and try to convert to automock what's convertible.