* GH Actions: Add nightly job to run Classic cluster tests
* Run tests as multi-jvm instead of multi-node
* Some minor adjustments
* Rename for clarity
* Use JDK 11
* Group some tests to reduce parallelism
* Allow to exclude multi-jvm tests using `-Dakka.test.names.exclude` property
* Exclude akka.cluster.Stress tests
* Move akka classic remoting job to nightly-builds workflow