test: Remove in memory build log

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Return after sending http error

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Remove CombinedLoggingHandler

Signed-off-by: Lewis Marshall <lewis@lmars.net>
test: Stream pending build logs

Signed-off-by: Lewis Marshall <lewis@lmars.net>