remove deprecated option application-credential-source (#3728)

Co-authored-by: Danielle Miu <29378233+DanielleMiu@users.noreply.github.com>

internal/api/genapi/input.go

@@ -964,11 +964,6 @@ var inputStructs = []*structInfo{
 				FieldType:   "string",
 				SkipDefault: true,
 			},
-			{
-				Name:      "ApplicationCredentialSourceIds",
-				ProtoName: "application_credential_source_ids",
-				FieldType: "[]string",
-			},
 			{
 				Name:      "BrokeredCredentialSourceIds",
 				ProtoName: "brokered_credential_source_ids",