[BUG] SchemaMapping does not rename model

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

I'm using the pistache generator with a schemaMapping:
MyObject: org.openapi.server.model.MyObj2

As expected, MyObject is not generated, but the end point is still using it - the "MyObject.h" header file is still included, and all calls use MyObject as an argument.

I would expect MyObject refs to be replaced with MyObj2.

If I add an importMappping such as:
MyObject: org.openapitools.server.model.MyObj2

the include "MyObject.h" is now replaced by MyObj without an include. The references remain unchanged.

openapi-generator version

6.5.0

OpenAPI declaration file content or url

Generation Details

Steps to reproduce

Related issues/PRs

Suggest a fix

Start with the Pistache generator entry point and its schemaMapping handling, reproducing the MyObject to org.openapi.server.model.MyObj2 case described in the issue. Inspect the generated MyObject.h include and endpoint argument references; the bug is done when mapped references use MyObj2 consistently and MyObject is not generated.