cmd/testwrapper: add support for the -vet test flag

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So callers can run testwrapper with -vet=off if they're already
running vet explicitly in a concurrent test job.

Updates tailscale/corp#28679

Change-Id: I74ad56e560076d187f5e3a7d7381e1dac89d860c
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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