tailcfg,ipn/ipnlocal: add hostinfo field to replace service entry

Updates tailscale/corp#15437
Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f