Improve process & documentation for non-k/k projects

[tallclair]

• decide what the PSC's role & involvement should be
• write prescriptive checklist that can be followed by subproject owners without incident response experience
• decide how vulnerabilities are communicated

[tallclair]

/help

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[tallclair]

/remove-lifecycle stale

The bug bounty puts core Kubernetes in Tier 1, and GA subprojects in Tier 2. We'd like to make this explicit on each project, and also formalize what that means for PSC support (possibly with more tiers).

/cc @cjcullen @joelsmith

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[tallclair]

/remove-lifecycle stale
/lifecycle frozen