Action::linkToCrudAction() does not work in EA 5

[jacekkow]

Describe the bug
Creating a custom action pointing to CRUD method does not work at all in EasyAdmin 5. It works fine in version 4 (at least with AdminAction annotation - see #6780)..

To Reproduce

1. Install https://github.com/EasyCorp/easyadmin-demo
2. Go to "Comments".
3. Try to use "Approve", "Reject" or "Mark as spam" custom actions.

Rather than executing action, those are links to /en/admin?entityId=X (main dashboard page).

Additional context
It seems that the routes are not generated for custom actions, even those tagged with AdminAction annotation.

[javiereguiluz]

Thanks for reporting this.

We forgot to add some deprecation messages, some better error messages and some content in the UPGRADE guide related to the custom CRUD action changes. We're doing that in #7493.

[jacekkow]

Thanks! That is exactly what I was missing.