[epiphany] (8 commits) ...CI: suppress cppcheck unreadVariable warning

[Jan-Michael Brummer <jbrummer src gnome org>]

Summary of changes:

  7b6d20a... embed-shell: use cancellable where required (*)
  d947d74... web-process-extension: add cancellable and use it where req (*)
  471892f... web-view: use a cancellable where required (*)
  46af096... flatpak-utils: use cancellables where required (*)
  2596422... snapshot-service: use cancellable, or ref, where required (*)
  1d519fc... window-commands: use cancellables where required (*)
  e2a199e... window-commands: remove Google+ from hardcoded web app name (*)
  9140276... CI: suppress cppcheck unreadVariable warning (*)

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