[BUG] Import mapping not working for return type

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

This is related to bug https://github.com/OpenAPITools/openapi-generator/issues/14525 which is already fixed for java, but when using generator "spring" and library "spring-cloud", instead of Collection, array<Collection> is generated.

    typeMappings.set([
            "OffsetDateTime" : "java.time.LocalDateTime",
            "array" : "Collection",
    ])

Generated Source

@ResponseStatus(HttpStatus.OK)
    array<Collection<Language>> findLanguages()

openapi-generator version

7.0.0

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with the Spring generator's spring-cloud library and its typeMappings handling, then compare the behavior with the Java fix referenced in issue #14525. Reproduce the generated return type from the YAML mapping shown; done means it is Collection rather than array<Collection>.