Enhance feature activation for BC

## Feature Description

Once a site receives a remote feature, it is stored persistently in a special setting which is not deleted on a normal reset. While it's rather unlikely, it is possible a user could end up with a poor experience should they downgrade Site Kit after receiving a feature that shouldn't be active on an older version of the plugin. This would then require a simple change in our activation handler to only enable if the current SK version also satisfied the feature's minimum.

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## Acceptance criteria

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## Implementation Brief

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### Test Coverage

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## QA Brief

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## Changelog entry

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