[JAVA] enums with underscores are trimmed

Description

When I generate models with enums that include underscores, the enum variable gets trimmed. This is causing other code dependent on the model to not compile since it expects the enums to include the underscores. I reproduced this using a slightly-altered version of the petstore example at https://petstore.swagger.io/v2/swagger.json. For example, I changed the status enum in the Pet object to

                "status": {
                    "type": "string",
                    "description": "pet status in the store",
                    "enum": ["TEST_AVAILABLE", "TEST_PENDING", "TEST_SOLD"]
                }

This generated the following java model:

  // ...
  public enum StatusEnum {
    AVAILABLE("TEST_AVAILABLE"),
    PENDING("TEST_PENDING"),
    SOLD("TEST_SOLD");
  //...

Notice that the enum variables are trimmed versions of the values (AVAILABLE instead of the expected TEST_AVAILABLE, even though TEST_AVAILABLE is a valid enum value).

Swagger-codegen version

3.0.24

Swagger declaration file content or url

https://gist.github.com/jspaceface/89016d7da7d3a84d91184d2e0d9ebf15

Command line used for generation

swagger-codegen generate -i ./swagger-test.json -l java -o ./swagger-out

Steps to reproduce

1. Download the linked swagger-test.json declaration file
2. Run the above codegen command
3. Inspect ./swagger-out/src/main/java/io/swagger/client/model/Pet.java

Related issues/PRs

https://github.com/swagger-api/swagger-codegen/issues/4805

Suggest a fix/enhancement

I would expect the enum values to match how they are defined in the declaration file.

Start with the linked swagger-test.json and run the documented swagger-codegen command, then inspect Pet.java under the generated model path. Compare the generated StatusEnum constants with TEST_AVAILABLE, TEST_PENDING, and TEST_SOLD; done means the Java enum names retain the underscore-containing values from the declaration.