Fix missing import for JsonTypeName for jersey2

Created by: christian0101

Fix missing import for JsonTypeName for jersey2. Similar to https://github.com/OpenAPITools/openapi-generator/issues/8157 , but for jersey 2 and array type.

Example spec: https://github.com/christian0101/openapi-gen-alias-type-bug

This PR is to fix the jersey2 library, however it would make sense to fix this in a more sophisticated way. The template is correct at the Java level, but the library overwrites it and causes the issue.

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