Default values in the OpenAPI specification is not properly added in the generated code

[TharmiganK]

Description:

$Subject

Identified from: #6906

Steps to reproduce:

Please use the following OpenAPI specification to reproduce the issue:

openapi: 3.0.1
info:
  title: Service Openapi Yaml
  version: 0.0.0
servers:
- url: "http://{server}:{port}/"
  variables:
    server:
      default: localhost
    port:
      default: "8080"
paths:
  /albums/{id}:
    get:
      operationId: getAlbumsId
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      responses:
        "200":
          description: Ok
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Album'
components:
  schemas:
    Album:
      required:
      - author
      - title
      type: object
      properties:
        iid:
          type: integer
          format: int64
          default: -1
        title:
          type: string
        author:
          type: string
        genre:
          allOf:
          - $ref: '#/components/schemas/Genre'
          default:
            name: Unknown
            description: Unknown
      additionalProperties: false
    Genre:
      required:
      - description
      - name
      type: object
      properties:
        name:
          type: string
        description:
          type: string
      additionalProperties: false

The generated type look like this:

public type Album record {|
    int iid = "-1";
    string title;
    string author;
    Genre genre = "{"name":"Unknown","description":"Unknown"}";
|};

Affected Versions:

Ballerina SwanLake Update 10(2201.10.x)

[github-actions]

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      - Reason/EngineeringMistake - The issue occurred due to a mistake made in the past.
      - Reason/Regression - The issue has introduced a regression.
      - Reason/MultipleComponentInteraction - Issue occured due to interactions in multiple components.
      - Reason/Complex - Issue occurred due to complex scenario.
      - Reason/Invalid - Issue is invalid.
      - Reason/Other - None of the above cases.