Add Enum imports in Entity Tests

[danielpetisme]

Describe the bug When an entity use an Enumeration type, the generated test does not import properly the enum class nor items

To Reproduce

• Download the JDL file https://github.com/jhipster/jdl-samples/blob/main/online-shop.jh
• Run jhipster-quarkus import-jdl online-shop.jh
• Once generated run ./mvnw test

Expected behavior The test compilation should work.

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