`sonar.auth.groupsSync` property as boolean conflicts with nested `sonar.auth.groupsSync.claimName`

[bdellegrazie]

In trying to translate the configuration to YAML or JSON the groupsSync property, being a boolean, breaks when needing to model groupsSync as an object to set the groupSync.claimName property.

Could we move groupsSync (boolean) to groupsSync.enabled instead please? This is similar to the convention for the Sonarqube's SAML property names too.