Compile and run tests generated by `ContestEstimator`

[Domonion]

Description

Compile and run tests generated by ContestEstimator as pipeline in Gradle. This will help us checking if tests are compilable, working, gather JaCoCo statistics (#1736) and upload this statistics to Grafana.

Also local testing scenario will be simplified to simple Gradle command - currently it requires running IDEA and changing source code.

Requires: #1742