Post-migration Experience: Add the "Review the site's content" task

[valterlorran]

Related to pfuQfP-IF-p2

This task should redirect the user to their site so they can validate whether it is working as expected. This task should be complete when clicking on it.

For that, we simply need to add the task ID to this constant:

https://github.com/Automattic/wp-calypso/blob/trunk/packages/launchpad/src/setup-actions.ts#L8-L18

[valterlorran]

Closing this as we already merged everything related to this:

• Post-migration Experience: Add the completion logic for the Review Site task wp-calypso#95144
• Post-migration Experience: Add the "Review the site's content" task #39641