Brad Fitzpatrick ac1215c7e0 tstest/integration: export test helpers
In prep for Taildrop integration tests using them from another package.

Updates #15812

Change-Id: I6a995de4e7400658229d99c90349ad5bd1f503ae
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2025-04-28 16:35:19 -07:00
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