feature/featuretags: add MinTags, use it in three places

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cmd/featuretags --min, cmd/tsconnect/wasmbuild, and a cmd/tailscaled
test each computed "omit every feature except these" on their own.
Move that into featuretags.MinTags so other Go code (such as upcoming
natlab vmtests of minimal builds) can compute the tags without running
cmd/featuretags. No behavior change.

Updates #12614

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: Ie0a5faf1f1d3e4e035326572b16f20180671d1c4

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