Backfill counter includes disabled collections in the count

[travjenkins]

Bug
If you have an entity with disabled collections these are included. These should not be included as it can make it seem like the count of X of Y bindings is off. This is especially true when enabling ALL bindings as it can then look like more bindings are able to be backfilled than can be.

Expected
Only enabled bindings are included in the count

To fully implement this we'll need to handle better when a user is enabling a previously disabled binding. As if they click "Backfill All" with some bindings disabled and then go enable a binding... that binding won't be marked. However, since it is recently enabled we could just show the toggle as checked anyway. As this is what will happen from the user's perspective.

Screenshots
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Desktop (please complete the following information):
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Additional context
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[kiahna-tucker]

BLOCKED: The client needs a way to know which bindings are new to the specification and which of the existing bindings were enabled (ref: flow issue 1783).