Unleash / unleash-edge / #808

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fix: Handle archived/deleted projects (#324)

Previously, our cache refresh algorithm assumed that the response from
upstream contained all projects we wanted to do updates to. Wayfair
correctly reported this breaking their opportunity to archive/delete
projects, since the cache would still contain deleted projects.

This patch updates Edge to use the projects the token has access to
decide whether or not to keep the elements in cache.

New flow:
1. Fetch projects from token
2. Filter out all features belonging to these projects
3. Extend remaining list with update from response
4. Return extended list.

fixes: #323

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