[ITL] to extend the output of "icinga" check command

[BorisTrnka]

Hello team,

I'd like to request extending the output of "icinga" check command for the issue with failed validation (or also for others errors).
Currently the check returns output like:
Icinga 2 has been running for 6 hours, 46 minutes and 17 seconds. Version: v2.13.6; Last zone sync stage validation failed at 2024-03-11 02:19:53 -0400

Would it be possible to add also additional info about why the validation failed exactly (the output from the log)? Surely not the full log, but at least first 3-10 errors.

Thanks.

[Al2Klimov]

Duplicate of #7263