Changes to Initiate a model version upload

added ArtifactSource to the source request property allOf list

added ModelSpec to the spec request property allOf list

added RemoteSourceKind to the remoteSourceKind request property allOf list

removed the enum value custom of the request property remoteSourceKind

removed the enum value dockerPush of the request property source

removed the enum value external of the request property source

removed the enum value hf of the request property remoteSourceKind

removed the enum value http of the request property remoteSourceKind

removed the enum value oci of the request property remoteSourceKind

removed the enum value oras of the request property source

removed the enum value s3 of the request property remoteSourceKind

removed the enum value webUpload of the request property source

the remoteSourceKind request property type changed from string to no type

the source request property type changed from string to no type

the spec request property type changed from object to no type