Better handling of Inline schema (#15682)

* skip allOf inline subschema created as $ref

* add option for fallback

* add back atleastonemodel

* add log

* update java, kotlin, js samples

* update tests

* fix native client test

* fix java client errors by regenerating test files

* clean up python

* clean up powershell

* clean up php

* clean up ruby

* update erlang, elixir

* update dart samples

* update ts samples

* update r, go samples

* update perl

* update swift

* add back files

* add back files

* remove outdated test files

* fix test

samples/client/petstore/java/feign-no-nullable/api/openapi.yaml

@@ -1364,15 +1364,29 @@ components:
     Dog:
       allOf:
       - $ref: '#/components/schemas/Animal'
-      - $ref: '#/components/schemas/Dog_allOf'
+      - properties:
+          breed:
+            type: string
+        type: object
     Cat:
       allOf:
       - $ref: '#/components/schemas/Animal'
-      - $ref: '#/components/schemas/Cat_allOf'
+      - properties:
+          declawed:
+            type: boolean
+        type: object
     BigCat:
       allOf:
       - $ref: '#/components/schemas/Cat'
-      - $ref: '#/components/schemas/BigCat_allOf'
+      - properties:
+          kind:
+            enum:
+            - lions
+            - tigers
+            - leopards
+            - jaguars
+            type: string
+        type: object
     Animal:
       discriminator:
         propertyName: className
@@ -2165,29 +2179,6 @@ components:
       required:
       - requiredFile
       type: object
-    Dog_allOf:
-      properties:
-        breed:
-          type: string
-      type: object
-      example: null
-    Cat_allOf:
-      properties:
-        declawed:
-          type: boolean
-      type: object
-      example: null
-    BigCat_allOf:
-      properties:
-        kind:
-          enum:
-          - lions
-          - tigers
-          - leopards
-          - jaguars
-          type: string
-      type: object
-      example: null
   securitySchemes:
     petstore_auth:
       flows: