Enable many javalib/util/* tests other than Sets for Scala.js
Enable many javalib/util/* tests other than Sets for Scala.js

Partial fix for lampepfl#7113

Just enabling the tests which already passed. It looks like the upstream
tests need updating for the Set pieces.

sjrd/dotty,dotty-staging/dotty,sjrd/dotty,lampepfl/dotty,dotty-staging/dotty,dotty-staging/dotty,lampepfl/dotty,lampepfl/dotty,lampepfl/dotty,dotty-staging/dotty,sjrd/dotty,sjrd/dotty,dotty-staging/dotty,sjrd/dotty,lampepfl/dotty