backstage release v2.90.0

Added

• (flux-react,kubernetes-react) Show Flux Operator resources in the Flux UI in #2723 by @marians

Fixed

• (gs) Show every installation’s versions on the Installations page in #2726 by @teemow

Full Changelog: https://github.com/giantswarm/backstage/compare/v2.89.1...v2.90.0