chore: remove obsolete v0 validation caller workflows - #140

Process completed with exit code 1.

Validation failed — see summary and annotations above

[P-032] API readiness checklist file 'documentation/API_documentation/network-slice-booking-API-Readiness-Checklist.md' should be removed from the API repository; use the canonical ReleaseManagement readiness documentation instead | Suggestion: Delete the obsolete API readiness checklist file(s). It is replaced by the new Release process and API Readiness documentation.

[P-032] API readiness checklist file 'documentation/API_documentation/network-slice-assignment-API-Readiness-Checklist.md' should be removed from the API repository; use the canonical ReleaseManagement readiness documentation instead | Suggestion: Delete the obsolete API readiness checklist file(s). It is replaced by the new Release process and API Readiness documentation.

[S-039] Operation must document the 'x-correlator' request header parameter

[S-039] Operation must document the 'x-correlator' request header parameter

[P-039] externalDocs.description in code/API_definitions/network-slice-booking.yaml is 'Project documentation at CAMARA' — expected 'Product documentation at CAMARA' | Suggestion: Set externalDocs.description to exactly "Product documentation at CAMARA".