Add missing media type picker

[iOvergaard]

What it says + now using it to configure the MediaPicker which should be able to choose media types and not use the Tree Picker.

Warning

I ended up messing about with the input values coming from the server. @kjac looked into it and said that all types are migrated to comma-separated strings, so I aligned the 4 different property editor UI's here, so we don't need to go back and forth with different value types.

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[loivsen]

Looks like there picked items from input-media-type doesn't render in the UI. Saves correctly though.
Maybe can add a catch => undefined to the modal as well while we at it 🥰

[iOvergaard]

Looks like there picked items from input-media-type doesn't render in the UI. Saves correctly though. Maybe can add a catch => undefined to the modal as well while we at it 🥰

You are right. I don't think it's related to this, though. Those input types should "just work".

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Azure Static Web Apps: Your stage site is ready! Visit it here: https://ambitious-stone-0033b3603-1383.westeurope.1.azurestaticapps.net

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Azure Static Web Apps: Your stage site is ready! Visit it here: https://ambitious-stone-0033b3603-1383.westeurope.1.azurestaticapps.net

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Azure Static Web Apps: Your stage site is ready! Visit it here: https://ambitious-stone-0033b3603-1383.westeurope.1.azurestaticapps.net

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Azure Static Web Apps: Your stage site is ready! Visit it here: https://ambitious-stone-0033b3603-1383.westeurope.1.azurestaticapps.net

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[leekelleher]

Tested it out, works as expected.

Spotted a small missing const import, (for MNTP's Member Type picker UI), which I've updated on here. All good.

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