ezpublish-kernel v8.0.0-beta3 support

[damianz5]

Ezpublish-kernel v8.0.0-beta3 support

related: ezsystems/ezpublish-kernel#2839

[damianz5]

Hi @gggeek, could you please squash and merge this PR, thank you

[ryanolee]

Hi @damianz5,
As a quick update on what might still need doing on this the RoleManger.php needs it's calls to the "addPolicy", "unassignRoleFromUser", "deletePolicy" and "updateRole" been moved out into a separate service / into that class to avoid BC breaks.

Appropriate replacements look like they may exist in the "EzSystems\EzPlatformAdminUi\Service\Role" service. Not sure if we would want to re-implement that functionality here or if there is a better way of doing it 🤔

https://doc.ezplatform.com/en/master/releases/ez_platform_v3.0_deprecations/#api-methods

Began work on something for this here:
ryanolee@4aedbe2

[gggeek]

Thanks!

I am currently merging this manually in tanoconsulting/ezmigrationbundle2 - branch main