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Replace Differential "unit stars" with icons

Description

Replace Differential "unit stars" with icons

Summary:
Ref T9764. These "star" icons are unclear, inconsistent, and not friendly to colorblind users.

They date from a time long ago when the product didn't have icons.

Modernize them and make them more consistent with the similar statuses in Harbormaster.

Test Plan:

Screen Shot 2021-03-17 at 1.24.47 PM.png (164×217 px, 6 KB)

Screen Shot 2021-03-17 at 1.24.18 PM.png (389×1 px, 37 KB)

Screen Shot 2021-03-17 at 1.24.40 PM.png (61×244 px, 4 KB)

Maniphest Tasks: T9764

Differential Revision: https://secure.phabricator.com/D21639