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Adds description and summary to `favorite` endpoints
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Closes #
[1-1098](https://linear.app/unleash/issue/1-1098/openapi-features-favorites)
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Signed-off-by: andreas-unleash <andreas@getunleash.ai>
Co-authored-by: Thomas Heartman <thomas@getunleash.ai>
Adds ability to favorite projects.
1. Can favorite project
2. Can unfavorite project
3. Favorite field is returned on `/api/admin/projects/default`
4. Favorite field is returned on` /api/admin/projects`
