Fix BlockService to work with current Form

[haivala]

Subject

I am targeting this branch, because {reason}.

Closes #{put_issue_number_here}.

Changelog

### Fixed
- Fix FormatterBlockService to work with current form.

[haivala]

With this code the block works in SonataPageBundle 4.x

[jordisala1991]

Can you add a changelog?

[haivala]

Can you add a changelog?

Sure I can. What should I write? Fixed: FormatterBlockService works with current form ?

[jordisala1991]

There are 2 things:

1. the changed code is about formatterType changes on 5.0, it has nothing to do about page
2. It could still be compat with page 3. But still even if this bundle does not use/declare anything about page, it wont be compatible because of shared deps like admin.

[jordisala1991]

Cs fixer needs to be fixed. Rector not sure how to fix it tho, it seems to be incompatible with some latest release of phpstan.

[haivala]

What should i do with rector?

[VincentLanglet]

What should i do with rector?

Just ignore it, we'll merge the pr ;)

[jordisala1991]

Thank you @haivala . Take a look at my last edit for the changelog, this is how it should look like to be able to auto generate the final changelog for the release.