This change improves the initial fuzz seeds to get better coverage. It also includes a fix to the geo fuzzing to avoid a harness induced failure when a NaN input is provided.
No actual code logic changes, test only.
Updates tailscale/corp#46608
Change-Id: I0985b6d3a75603927451eea0a25f4cd72c039795
Signed-off-by: Mike Jensen <mikej@tailscale.com>