[FLINK-24995][tests] EnumValueSerializerCompatibilityTest doesn't compile on later Scala versions

[zentol]

ConsoleReporter#printSummary was removed in 2.12.13 and 2.13.0. We can use #finish instead which is equivalent and available in all versions.

https://www.scala-lang.org/api/2.12.7/scala-compiler/scala/tools/nsc/reporters/ConsoleReporter.html#finish():Unit
https://www.scala-lang.org/api/2.12.12/scala-compiler/scala/tools/nsc/reporters/ConsoleReporter.html#finish():Unit
https://www.scala-lang.org/api/2.13.7/scala-compiler/scala/tools/nsc/reporters/ConsoleReporter.html#finish():Unit

Additionally the test now fails if the compiler reports a warning or error, so we actually get some benefit from the summary.
Alternatively, we could also just remove it, but I can't really decide that.

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