Add contact (slack, mailing_list, teams) to subprojects

Demonstrate by adding slack channels for sig-testing subprojects
that already have their own slack channels

Add a GitHub team related to conformance to sig-arch's conformance
definition subproject

GitHub teams as implemented now are very kubernetes-org centric,
I'm not trying to change that here, would suggest a followup
change to allow for the use of github teams in other orgs
(like kubernetes-sigs)

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