util/set: add SmallSet.SoleElement, fix bug, add more tests

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This adds SmallSet.SoleElement, which I need in another repo for
efficiency. I added tests, but those tests failed because Add(1) +
Add(1) was promoting the first Add's sole element to a map of one
item. So fix that, and add more tests.

Updates tailscale/corp#29093

Change-Id: Iadd5ad08afe39721ee5449343095e389214d8389
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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