Adding websockets playground project into ci

Task-number: QTQAINFRA-788
Change-Id: Id07a762d89750420319a89b773830ceb9022b7e8
Reviewed-by: Kurt Pattyn <pattyn.kurt@gmail.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>
qtqa: Adding some release branches to CI

Adding QtAndroidExtras, QtWinExtras and QtMacExtras release
branches into CI.

Change-Id: Ia81d266292a2e8a33bb86a2ccbaaf3277d4ccf17
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>