archive-coverage & add-forge-now: Add new supported forge types stagit & gitiles
This updates the coverage widget and the add-forge-now apps with the new supported forge types. In separated commits (1 per functionality: add-forge-now ui, coverage widget).
This also adds another commit to fix missing assertion change for origins coming from forge without any logo.
Refs. swh/meta#5048 (closed)
Edited by Antoine R. Dumont