util/testenv: add func to report whether a testing.TB is in parallel mode

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For future in-memory network changes (#15558) to be able to be
stricter and do automatic leak detection when it's safe to do so, in
non-parallel tests.

Updates tailscale/corp#27636

Change-Id: I50f03b16a3f92ce61a7ed88264b49d8c6628f638
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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