stacks: applyable status should be dependent on applyable components #35350
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This PR updates the logic for deciding whether an overall stack is "applyable" so that it takes into account the applyable status of all component instances.
Previously, a stack was "applyable" as long as it had no error diagnostics. Now, a stack is applyable if it (a) has no error diagnostics and (b) at least one component is "applyable".
Finally, stack outputs are not currently stored as part of the state of a stack anywhere. This means that there is no need for the applyable status of a stack to depend on outputs. I've updated a TODO within the code that is calling for outputs to be added to state so that it also calls out that if/when this happens the applyable status of a stack should be updated to reflect that status of any outputs.