feat: [CI-14710]: Javadoc Conversion Logic

[Ompragash]

Added "Javadoc" support to go-convert specific to jenkins migration.

op-javadoc.json

go run main.go jenkinsjson -downgrade ~/Downloads/op-javadoc.json 

Example Harness v0 YAML

pipeline:
  identifier: default
  name: default
  orgIdentifier: default
  projectIdentifier: default
  properties:
    ci:
      codebase:
        build: <+input>
  stages:
  - stage:
      identifier: build
      name: build
      spec:
        cloneCodebase: true
        execution:
          steps:
          - stepGroup:
              identifier: Stage__nullb5a696
              name: Checkout
              timeout: ""
          - stepGroup:
              identifier: Stage__nullcbb8ae
              name: Build
              steps:
              - step:
                  identifier: sh574fb7
                  name: sh
                  spec:
                    command: cd complete && gradle clean build --info --stacktrace
                    image: alpine
                    shell: Sh
                  timeout: ""
                  type: Run
              timeout: ""
          - stepGroup:
              identifier: Stage__nullc2abc0
              name: Generate Javadoc
              steps:
              - step:
                  identifier: sh34c17c
                  name: sh
                  spec:
                    command: cd complete && gradle javadoc --info --stacktrace
                    image: alpine
                    shell: Sh
                  timeout: ""
                  type: Run
              timeout: ""
          - stepGroup:
              identifier: Stage__nulld86474
              name: Publish Javadoc
              steps:
              - step:
                  identifier: f14ddfd46ceb566c
                  name: Upload and Publish Javadoc
                  spec:
                    image: harnesscommunity/drone-s3-upload-publish
                    settings:
                      aws_access_key_id: <+input>
                      aws_bucket: <+input>
                      aws_secret_access_key: <+input>
                      source: complete/build/docs/javadoc
                      target: <+pipeline.name>/<+pipeline.sequenceId>
                  timeout: ""
                  type: Plugin
              timeout: ""
        platform:
          arch: Amd64
          os: Linux
        runtime:
          spec: {}
          type: Cloud
      type: CI