DisCo randomly breaks the Java compilation in Github Actions

[Eddykasp]

Although the problem has so far not been reproduced locally, there is consistently a problem with the Java compilation when building elkjs in Github Actions.

The error is "The type CompactionStrategy in Disco.melk cannot be resolved".

The error does not happen consistently for certain configurations. Re-running failed tests repeatedly will eventually cause them all to pass. Since this completely disables the reliability of the CI pipeline we are excluding DisCo for the time being until we can identify and resolve the problem.

#288 removes DisCo from elkjs by excluding it from transpilation.