logtail: help the server be more efficient

Add content length hints to headers.
The server can use these hints to more efficiently select buffers.

Stop attempting to compress tiny requests.
The bandwidth savings are negligible (and sometimes negative!),
and it makes extra work for the server.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f