[BUG][protobuf-schema] Protobuf generator does not respect enableEnumPrefixRemoval

Created by: JulianGmp

Bug Report Checklist

Have you provided a full/minimal spec to reproduce the issue?
Have you validated the input using an OpenAPI validator (example)?
Have you tested with the latest master to confirm the issue still exists?
Have you searched for related issues/PRs?
What's the actual output vs expected output?
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Description

When setting enableEnumPrefixRemoval=false, the protobuf-schema generator does not respect the flag and removes the enum value prefixes anyway.

openapi-generator version

openapi-generator-cli 6.0.0-SNAPSHOT
  commit : 8a2131f
  built  : 2022-02-01T15:07:00+01:00
  source : https://github.com/openapitools/openapi-generator
  docs   : https://openapi-generator.tech/

OpenAPI declaration file content or url

test.yaml

openapi: 3.0.0
info:
  title: Sample API
  description: Optional multiline or single-line description in [CommonMark](http://commonmark.org/help/) or HTML.
  version: 0.1.9

servers:
  - url: http://api.example.com/v1
    description: Optional server description, e.g. Main (production) server

components:
  schemas:
    userinfo:
      properties:
        something:
          type: string
          format: enum
          enum:
          - MY_ENUM_a
          - MY_ENUM_b
        somethingElse:
          type: string
          format: enum
          enum:
          - MY_OTHER_ENUM_a
          - MY_OTHER_ENUM_bla

paths:
  /users:
    get:
      summary: Returns a list of users.
      description: Optional extended description in CommonMark or HTML.
      responses:
        '200':
          description: A JSON array of user names
          content:
            application/json:
              schema:
                $ref: '#components/schemas/userinfo'

Generation Details

Generated output:

syntax = "proto3";

package openapitools;


message Userinfo {

  enum SomethingEnum {
    A = 0;
    B = 1;
  }

  SomethingEnum something = 28014471;

  enum SomethingElseEnum {
    A = 0;
    BLA = 1;
  }

  SomethingElseEnum somethingElse = 396934355;

}

Expected:

syntax = "proto3";

package openapitools;


message Userinfo {

  enum SomethingEnum {
    MY_ENUM_A = 0;
    MY_ENUM_B = 1;
  }

  SomethingEnum something = 28014471;

  enum SomethingElseEnum {
    MY_OTHER_ENUM_A = 0;
    MY_OTHER_ENUM_BLA = 1;
  }

  SomethingElseEnum somethingElse = 396934355;

}

NOTE: This is especially a problem with protobuf, because enum values have to be globally unique (imagine C enums instead of Java enums). This is a general issue of translating openapi to protobuf, but that's out of scope for this bug report.

I added a prefix to the values in my project, specifically to prevent this, but the generator removes it despite the option set.

Note that I tried the java generator too, which respected the setting.

Steps to reproduce

java -jar ./openapi-generator-cli-master.jar generate -g protobuf-schema -i test.yaml -o testout/ --additional-properties 'enableEnumPrefixRemoval=false'