Update the horreum-api definition

[lampajr]

This is a big change but it shouldn't have any impact on external users as the API did NOT change.
The UI will be affected by this, therefore we should check that all functionalities are still working.

Fixes Issue

Fixes #2317

Changes proposed

• Re-enable the openapi TS client generation validation
• Remove python/go client generation as not needed here
• Update the horreum-api schemas definition
• Update the horreum-api services definition
• Update the UI accordingly
• Removed the allOf from all schemas

NOTE: the exposed API did NOT change!
NOTE: what would change is the client generation as the method names will change accordingly to the methods names in the horreum-api services

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.

[lampajr]

Tested locally and it looks good to me but I'd like to have another pair of eyes checking it 👀

[lampajr]

Removed the allOf from all schemas

I did this because given that our source of truth is horreum-api module (i.e., java code) I think they are not actually needed, especially because the client generation would be the same even without that allOf. With this the generated openapi spec is simpler w/o such allOf