Fix the child process logging #1287

[sergeypospelov]

Description

RD sends all errors occurred during a request processing to the caller.
If an error happened in the child process, the child process was returning the error to the caller, that is, the main process, without explicitly printing to the log file.

• Added explicit printing of the error to the log
• Moved runIdeaProcessWithDebug flag to UtSettings.

Fixes #1287

Type of Change

Please delete options that are not relevant.

• Minor bug fix (non-breaking small changes)

How Has This Been Tested?

Manual Scenario

To Reproduce section from #1287 passes.

Checklist:

• The change followed the style guidelines of the UTBot project
• Self-review of the code is passed
• The change contains enough commentaries, particularly in hard-to-understand areas
• No new warnings
• All tests pass locally with my changes