Reduce vfb-collectdata log size

[matentzn]

Currently 30MB + size of log with mostly irrelevant output

[matentzn]

see this idea as a potential solution:
https://github.com/VirtualFlyBrain/vfb-pipeline-dumps/blob/696c3b0f6a2c86d68c3ea2be9a0bc81dce097a59/dumps.Makefile#L3