types/logger, logpolicy: disable rate limiting, don't upload on Plan 9

To ease local debugging and have fewer moving pieces while bringing up
Plan 9 support.

Updates #5794

Change-Id: I2dc98e73bbb0d4d4730dc47203efc0550a0ac0a0
Signed-off-by: Brad Fitzpatrick <bradfitz@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