Miscellaneous Scala cleanup

[Scott-Guest]

This PR makes a couple quick changes analogous to runtimeverification/k#4055:

• Update scala-maven-plugin to its latest version
• Set the Java version by relying on <release> in maven-compiler-plugin inherited from the parent POM, rather than manually setting -source and -target for javac
• Disable various Scala language extensions and enable -Werror
  • One warning about pattern matching on an erased type
  • Remaining warnings were exhaustiveness issues fixed with a case _ => ???. This is poor style and an abuse of ??? IMO, but it's already pervasive throughout our codebase.

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[Baltoli]

Will need the changes to Maven usage from: runtimeverification/k#4108