Fix(logout): avoid an infinite loop when loading the demo apps for the first time

[jonathanarnault]

Problem

The e-commerce demo was rendering a blank page with many redirects to the logout page when loading the page for the first time. After a many seconds, the login form would render due to an history.pushState abuse.

Solution

Delay the store to avoid a race condition in useLogout that would cause the CoreAdminRoutes component to rerender the LogoutOnMount component leading to an infinite loop.

How To Test

Start the e-commerce demo with the following command:

make run-demo

The login page should load fast and no warning about history.pushState should be seen in the console.

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• The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

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