* Remove unconditional trace for index-state
We already have messages for unusual cases (like using the latest
index-state). This message is unconditional, so quite noisy.
We include the actual index-state in the builer log so it's available if you
want to check it.
* Move source-cleaning warning to builder log
It's not *that* interesting, and someone who cares will likely check the
log.
* Move shellFor trace message to builder log
Not that interesting, really.
Co-authored-by: Hamish Mackenzie <Hamish.Mackenzie@iohk.io>