cmd/containerboot: fix data race in TestContainerBoot

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Parallel subtests share *ipn.Notify pointers (e.g. runningNotify).
When multiple subtests reached the same phase concurrently, they
all wrote to the shared notify's InitialStatus field without
synchronization, triggering the race detector.

Fix by shallow-copying *ipn.Notify before setting InitialStatus,
so each test iteration works on its own copy.

Updates #19380

Change-Id: I9dd40037e02146166f006f4f7c1ddcc47adba191
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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