[Satosa] Rename metadata `presentation_definition` to `presentation_definitions_supported`

[Zicchio]

The satosa metadata configuration include a field called presentation_definition but in the current version of the specs it is called presentation_definitions_supported. For further references, see https://github.com/italia/eudi-wallet-it-docs/blob/fdd9cf44e69bd6eeb4cfb11684dd6f5e0e7c6a57/docs/en/relying-party-entity-configuration.rst?plain=1#L45-L46

[peppelinux]

presentation_definitions_supported will not be used anymore

policies should follow their own format according to eudiw

I imagine X.509 certificate extension and federation trust marks, which payload is still under definition