feat-sonarqube: Added sonar quality gateway conversion

[vanisrikanithi]

Sonar Quality Gate go-conversion:
Added "Sonar Quality Gate" support to go-convert specific to jenkins migration.

Sonar Quality Gate Jenkins Trace:
vani_sonar_Trace.json

go run main.go jenkinsjson --downgrade ~/go/vani_sonar_Trace.json

Sonar Quality Gate Harness test pipeline here.

Sonar Quality Gate harness pipeline step:

- step:
    identifier: waitforqualitygate6278c9
    name: Sonarqube_Quality_Gate
    spec:
      image: 'plugins/sonarqube-scanner:v2.4.2'
      settings:
        scm_disabled: 'false'
        skip_scan: 'false'
        sonar_host: <+input>
        sonar_key: <+input>
        sonar_name: <+input>
        sonar_organization: <+input>
        sonar_quality_enabled: 'true'
        sonar_qualitygate: OK
        sonar_token: <+input>
        sources: .
        timeout: '300'
    timeout: ''
    type: Plugin

[vanisrikanithi]

Hello @Ompragash,

Could you please review the PR for sonar quality gate conversion and provide your comments on that?

Thank you.