[gnome-software] (7 commits) ...Merge branch 'wip/origin-icons' into 'main'

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

Summary of changes:

  ed2ef1f... data: Add 'package-x-generic-symbolic' and 'snap-symbolic'  (*)
  f352f8b... gs-origin-popover-row: Default to "package-x-generic-symbol (*)
  83111c5... gs-details-page: Default to "package-x-generic-symbolic" or (*)
  355c77a... packagekit: Do not set an origin icon (*)
  c3ae103... rpm-ostree: Do not set an origin icon (*)
  94d41fb... snap: Use a "snap-symbolic" icon as an origin icon (*)
  f48d9d2... Merge branch 'wip/origin-icons' into 'main'

(*) This commit already existed in another branch; no separate mail sent