checks: system: max pid number when > 10 OSDs

In nodes where there are > 10 OSDs, the PID limit should be increased as each OSD may spawn lots of threads

No file, test, or entry point is named. Start by locating the system check that evaluates the maximum PID limit, then determine how the limit should scale for nodes with more than 10 OSDs. Done means the check applies the increased limit and coverage verifies the multi-OSD case.

Written by the indexing model from the issue text.