Implement Exclude List Row Actions

[zackcl]

This PR implements Edit/Delete actions for rows in the Exclude List table on the Feature Flag details page.

Resolves #1757, resolves #1775, resolves #1776, resolves #1818, resolves #1819, resolves #1820, resolves #1754

[danoswaltCL]

Just a couple minor comments, I think this should be good. I hope you found working with the UpsertPrivateSegmentListModal to be easy breezy.

[zackcl]

Thank you, I resolved your comments regarding sorting (I reverted the last commit). I think that makes sense since selectSelectedFeatureFlag is called frequently. I just thought it would be cleaner to handle the sorting in one place.

Ideally, I think sorting shouldn't be necessary because it seems that the Postgres database already contains the feature_flag_segment_inclusion data in the correct order (when I execute SELECT * FROM "feature_flag_segment_inclusion";). However, the order seems different when we actually fetch the data from the backend. I'm not sure if this is expected behavior from Postgres or TypeORM. Here's the relevant issue I created: #1827

Please feel free to approve this PR.