Fix the deprecation of testng xml suites #3452

Affected version

3.6.0

Bug description

The parameter got deprecated but

1. no warning or explicit log about it while keeping the support of the parameter
2. it was not dropped totally (since it is not supported)

Goal is to 1. ensure we do either align the impl on the @Deprecated annotation by supporting the runtime with a warning or 2. we totally drop the parameter and say we don't support it at all (note: maybe ensure all EE TCK moved away of this usage - or it is small enough to be worked around)