Damien Neil 3cc8b532f9 testing: add Attr
Add a new Attr method to testing.TB that emits a test attribute.
An attribute is an arbitrary key/value pair.

Fixes #43936

Change-Id: I7ef299efae41f2cf39f2dc61ad4cdd4c3975cdb6
Reviewed-on: https://go-review.googlesource.com/c/go/+/662437
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Auto-Submit: Damien Neil <dneil@google.com>
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API changes and other small changes to the standard library go here.