Use formattedValue on code editor detail to display JSON fields

[rogercbe]

Describe the bug
The documentation says to use TextField, TextAreaField or CodeEditorField field to display a Doctrine json type.

However, using CodeEditorField fails with:

Array to string conversion

This could be worked around by using ->formatValue(fn ($value) => json_encode($value)) but the template code_editor.html.twig does not use it for the DETAIL view.

The PR adds the formattedValue to the code_editor template so that it can be used

To Reproduce
EasyAdmin 4.6.1

1. Create a doctrine entity with a json field
2. Create a CrudController
3. Try to use the json field in a view

Related Issues:
#5680
#4388

[ndench]

Any chance you could also update the documentation to remove TextField and TextAreaField from the recommendations for a Doctrine json type?

[javiereguiluz]

Roger, thanks a lot for fixing this bug!

[conradfr]

Does not seem to work if the json has int as values.

And still get a An exception has been thrown during the rendering of a template ("Warning: Array to string conversion"). with CodeEditorField (4.10.2)

[gremo]

Doesn't not work also here, like @conradfr same exception thrown.