+act #16245 receive builder works with generic messages

UnitPFBuilder use CaseStatements as previously, because apply is cast to exact type ( not ? extends T )
PFBuilder.match working with generic messages
#16245 fix formatting and delete usages of diamond operator
!tes #16075 Change default awaitAssert interval to 100 ms
Merge pull request #16277 from akka/wip-16075-awaitAssert-interval-patriknw

!tes #16075 Change default awaitAssert interval to 100 ms
Merge pull request #16254 from tomekl007/16245-issue

#16245 receive builder could match generic messages, problem with scala ...
! akka-cluster: metrics collector improvements - resolve #16121

apply review #1