fix(transform): avoid duplicate enum declaration when using root types with no prefix

[Newbie012]

Changes

given the following settings:

enum: true,
rootTypes: true,
rootTypesNoSchemaPrefix: true

the generated output will declare an enum and a type with the same name. This PR will avoid redeclaring a type if its node is an enum.

How to Review

The PR is quite minimal - code adjustment + a test

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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Latest commit: 39b374d

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