Rework compilation errors

Currently all unsuccessful builds recorded as server-size exception. It makes noisy picture in error tracking system. The idea is not use exception as a mechanism to notify about unsuccessful build. It should be signaled via warning in logs with special marker to be able filter all messages related to unsuccessful builds.

Start by locating where unsuccessful builds are recorded as server-size exceptions and where build outcomes are logged or sent to error tracking. Trace that flow first; done means unsuccessful builds use a warning with a special filterable marker and no longer create noisy exception entries.

Written by the indexing model from the issue text.