[BUG][Go] Unused "bytes" import in v7.2.0

[dyurovskykh-tivo]

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• 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

#17267 moved import of bytes from a specific file model_simple.mustache to generator code that is applied to all files, including model_oneof.mustache that does not use bytes. And this leads to the following error:

schema/generated/some-config/model_object_model.go:14:2: "bytes" imported and not used

openapi-generator version

• 7.2.0
• latest

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: Test
  version: 1.0.0
paths: {}
components:
  schemas:
    NestedObject1:
      required:
        - field1
      properties:
        field1:
          description: Specifies an action name to be used with the Android Intent class.
          type: string
    NestedObject2:
      required:
        - field2
      properties:
        field2:
          description: Specifies an action name to be used with the Android Intent class.
          type: string
    Object:
      oneOf:
        - $ref: '#/components/schemas/NestedObject1'
        - $ref: '#/components/schemas/NestedObject2'

Generation Details

docker run --rm -u 1001:1001 -v "${PWD}:/local" openapitools/openapi-generator-cli:v7.2.0 generate -i /local/test.yaml -g go -o /local/out/go

Steps to reproduce

Run generator and try to build the generated code.

Related issues/PRs

#17267

Suggest a fix

Partial revert of #17267, in particular, code change suggested in #17267 (comment)

[dyurovskykh-tivo]

@wing328 @ctreatma
Please, check this bug.