[BUG] [kotlin-spring] Escaped backticks in parameters using reserved words

[franciscobretal]

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When an OpenAPI definition contains parameters named with kotlin reserved-words, instead of generating code with those names between backticks (e.g. `when`), they are escaped with HMTL character ` (i.e. `is`).

openapi-generator version

7.4.0

OpenAPI declaration file content or url

openapi: "3.0.0"
info:
  version: "1.0.0"
  title: "Minimal OpenAPI example"
paths:
  /test:
    get:
      parameters: 
        - name: "when"
          in: "query"
          schema:
            type: "string"
        - name: "as"
          in: "header"
          schema:
            type: "string"
        - name: "is"
          in: "path"
          required: true
          schema:
            type: "string"
        - name: "param"
          in: "cookie"
          schema:
            type: "string"
      responses:
        '200':
          description: "Successful operation"
    post:
      requestBody:
          content:
            application/x-www-form-urlencoded:
              schema:
                type: object
                properties:
                  is:
                    type: string
      responses:
        '200':
          description: "Successful operation"

Generation Details

Use the following cli command assuming the previous definition is in a openapi.yml file:

openapi-generator-cli generate -i openapi.yml -g kotlin-spring -o out -t -p serviceImplementation=true -p interfaceOnly=true -p delegatePattern=true

Steps to reproduce

Open the generated directory in your favorite code editor and do a global search for `. You should see multiple occurrences, which make the code not compilable.

Related issues/PRs

Related to:

• [BUG][KOTLIN] Generated code contains "`" instead of backtick, when using parameters with reserved kotlin names (kotlin-spring) #14026
• [BUG][KOTLIN] Generated code contains "`" instead of backtick, when using parameters with reserved kotlin names  #11304
• [BUG][KOTLIN] When using fields with reserved kotlin names and type enum, generated code contains "`" instead of backtick #11148

Suggest a fix

If {{paramName}} is changed to {{{paramName}}} in every template file, the code generates successfully.