Fix Git subprocess calls to suppress error output #271
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Silence all subprocess STDERR output from git subprocess calls. If there is an error, an exception will be thrown. We don't rely on STDERR for anything, and atm the Terminal Client gets a bunch of console output for git errors even though we already handle that w/ Exception try-catch blocks.
This PR is part of a series of PRs to remove
git_root
from Mentat, and allow Sessions to be run anywhere on the filesystem.