Add Accurate to the list of third party multi tenancy tools

[erikgb]

Description

With the PR to remove references to the archived HNC, #50544, I became aware of a list of references to third-party tools/operators to provide multi-tenant Kubernetes. We have been using Accurate for a long time, and it solves most of our multi-tenancy use cases, and I think it should be added to this list of references.

I'm also fixing an outdated link to Capsule. CC: @prometherion

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[divya-mohan0209]

Tagging #sig-multicluster here for the discussion. @kubernetes/sig-multicluster-pr-reviews

Please note that this was already up for discussion via #50519

[enj]

/sig auth