Adjust content type picker to support different content types

[bjarnef]

Prerequisites

• I have added steps to test this contribution in the description below

Description

Adjust editorService to have a dedicated documentTypePicker, while the current allow specifying entity type, but fallback to documentType which is current behaviour and to avoid a breaking change.

This also streamline the concept that content type is both content, media and member type, while document type is more specific.

Related to #15034

[github-actions]

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[bjarnef]

We need to make documentType default as it is the current behaviour.

[bjarnef]

I think we could simplify this part a bit to use the contentTypePicker instead of treePicker.

https://github.com/umbraco/Umbraco-CMS/blob/contrib/src/Umbraco.Web.UI.Client/src/views/propertyeditors/blocklist/prevalue/blocklist.blockconfiguration.controller.js#L106-L145

Update: simplified in 291adc4 - it could also just explicit use documentTypePicker.

[emmagarland]

Hi @bjarnef!

Thanks for your PR relating to #15034, to adjust the content type picker to support different content types.

One of the Core Collaborators team will review this as soon as possible - it also seems like one that we might want HQ to review, so we will likely need to contact them about it.

Best wishes

Emma

[nul800sebastiaan]

And related to merging #15034 - this one is great too, thanks again!