[Java] [Microprofile] Add Json-B polymorphism type info annotations (#20164)

* [Microprofile] Add Json-B polymorphism annotations

* [Microprofile] Set openApiNullable in configs to false

* [Microprofile] Bump JSON Bind version to 3.0

* [Microprofile] Only apply JSON-B polymorphism for MP 3.0

* Update samples

* [Microprofile] Update documentation/configs for openApiNullable

* Update docs

samples/client/petstore/java/microprofile-rest-client/docs/Pet.md

@@ -2,7 +2,6 @@
 
 # Pet
 
-A pet for sale in the pet store
 
 ## Properties
 
@@ -11,7 +10,7 @@ A pet for sale in the pet store
 |**id** | **Long** |  |  [optional] |
 |**category** | [**Category**](Category.md) |  |  [optional] |
 |**name** | **String** |  |  |
-|**photoUrls** | **List<String>** |  |  |
+|**photoUrls** | **Set<String>** |  |  |
 |**tags** | [**List<Tag>**](Tag.md) |  |  [optional] |
 |**status** | [**StatusEnum**](#StatusEnum) | pet status in the store |  [optional] |