cmd/tailscale/cli: make 'tailscale debug ts2021' try twice

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In prep for a future port 80 MITM fix, make the 'debug ts2021' command
retry once after a failure to give it a chance to pick a new strategy.

Updates #13597

Change-Id: Icb7bad60cbf0dbec78097df4a00e9795757bc8e4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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