Merge seek 1.15.2

[ReneHaensel]

Description

• merge Seek-1.15.2 into LDH 'main'
• contains the new functionality to publish data resources to GCHSH with RestClient error handling and MDS conformity check
• publish functionality for project, investigation and study extended Metadata in NFDI4Healh MDS

Changes

Features / major changes

• add publish button to Resource (Project, Investigation and Study) action menu
• add transformation functionality of extended metadata to a verified MDS conform schema
• add GCHSH Token Purchasing
• add publish functionality to GCHSH
• add error handling routine for the RESTCient communication processes
• add feature to the admin panel to enable/disable it and organise credentials for Validator, GCHSH Token access and GCHSH publish portal
• add Require to extended Metadata input of resource Type, Title, Acronym, Description and languages of these inputs

[whomingbird]

The only missing part is test.

[MasoudAbedi]

looks good to me.