- Adds a remote content browser to contain `about:shoppingsidebar` in `review-checker.xhtml` and update the Review Checker sidebar to use that wrapper document.
- Adds ReviewChecker actors for the sidebar Review Checker panel.
- ReviewCheckerParent is a simplified version of the ShoppingSidebarParent as it does not need to handle the state of the sidebar opening or closing.
- ReviewCheckerChild is just extends ShoppingSidebarChild for now, though it will need to be separate in the future.
- Adds a browser.shopping.experience2023.shoppingSidebar boolean pref to disable ShoppingSidebar actors when they are not needed.
- Fixes `AbortError` error handling when the outer sidebar browser is removed.
Note that any auto-opening or closing behavior will need to be added afterwards, as these actors are not around to check product urls when the sidebar is closed.
Differential Revision: https://phabricator.services.mozilla.com/D222840
2a40aed615