Try reverting "compress on upload"

[adeebshihadeh]

#34528 broke compressed logs. It wasn't caught in CI since we use what's on disk in CI, which isn't what gets uploaded. We can add tests, but I think we should also investigate moving the compression back to loggerd.

IIRC we did that for two reason:

1. CPU usage
2. Getting as much as possible in the case of sudden power loss

#1 should be much better with zstd, and #2 is better defined now.

[adeebshihadeh]

@deanlee want to try this out?

[deanlee]

#34528 broke compressed logs

@adeebshihadeh The issue occurred because the original LogReader was using zstd.decompress(data) and was unable to handle streaming zstd-compressed logs. This has been fixed in in PR #34549.