Clarify health metrics in workspaces

[BekahHW]

We'll be adding a health metric to our workspaces for repo insights that differs from activity.

We need to communicate more information about this metric with our users both as a definition and how it fits in context with the other metrics we're currently tracking.

[DevJSter]

.take

[github-actions]

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[BekahHW]

@DevJSter this isnt ready yet. Bur there are other issues open. So check those out.