[BUG] getters and setters in scala codegen are incorrectly escaped

Bug Report Checklist

[x] Have you provided a full/minimal spec to reproduce the issue?
[x] Have you validated the input using an OpenAPI validator (example)?
[x] Have you tested with the latest master to confirm the issue still exists?
[x] Have you searched for related issues/PRs?
[x] What's the actual output vs expected output?

Description

For a member that's a reserved word, several properties passed to the mustache template contain backticks.

for example, properties from debugModels:

{
        "baseName" : "type",
        "getter" : "get`Type`",
        "setter" : "set`Type`",
        "name" : "`type`",
        "defaultValueWithParam" : " = data.type;",
        ...,
}

openapi-generator version

Master

Generation Details

This occurs using any of the scala-based generators where the model contains a keyword

Steps to reproduce

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/12226

Which incorrectly tags this as specific to just scala-sttp and enums

Suggest a fix

The properties getter, setter, nameInCamelCase and nameInSnakeCase should be based on the unquoted form of the member name.

The root problem is that DefaultCodegen uses toVarName

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java#L3636-L3641

also used here: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java#L3842

But that happens after escaping: https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractScalaCodegen.java#L291

The quickest fix would be to override getterAndSetterCapitalize in AbstractScalaCodegen to not perform escaping

OpenAPITools / openapi-generator