This PR makes changes to how the project overview skeleton screen works.
Important changes:
- Add skeleton screens to missing elements, creating a more
comprehensive loading screen
- Split the page into different loading sections, so that we can load
the table when we fetch the next page without affecting the rest of the
page.
https://www.loom.com/share/e5d30dc897ac488ea80cfae11ffab646
Next steps:
* Hide bar if total is less than 25
* Add FE testing
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Adds last seen by environment to FeatureOverview
- Refactored FeatureEnvironmentSeen component for reusability
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Closes #
[1-1223](https://linear.app/unleash/issue/1-1223/toggle-overview-add-last-seen-by-environment)
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Signed-off-by: andreas-unleash <andreas@getunleash.ai>
