Test failures started to happen sporadically on some builds after the introduction of NotifyContext.
To make these tests more robust and avoid the risk of crosstalk we run them in a separate process.
Fixes #41561.
Change-Id: Ia7af105c316afd11765358f1e5e253ccfe2adc2b
Reviewed-on: https://go-review.googlesource.com/c/go/+/270198
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Cherry Zhang <cherryyz@google.com>