Design.plone.ioprenoto

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- Fix problem with DefaultJSONSummarySerializer hineritance in prenotazioniFolder
DefaultJSONSummarySerializer override.
[lucabel]
- Add the plone.restapi>=9.6.0 constaint.
[folix-01]

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- Fix: term values must be unique in booking_type vocabulary
[mamico]

- Fix booking_type encoding
[mamico]

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- booking_type vocabulary for Service
[mamico]
- Align tests with redturtle.prenotazioni > 2.2.5.
[cekk]

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- [BREAKING CHANGE] Compatibility with redturtle.prenotazioni>=2.2.0.
[folix-01]
- Handle missing infos in prenotazioniFolder serializer.
[cekk]
- Add the UO.contact_info field to bookable-uo-list response.
[folix-01]
- Extend prenotazioni email vars list (unita_organizzativa_title, booking_print_url_with_delete_token).
[folix-01]

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- Inherit redturtle.prenotazioni browser layer.
[folix-01]

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- Compatibilize with the 2.1.3redturtle.prenotazioni version.
[folix-01]