Backport "Parallelise JVM backend - Scala 2 port" to LTS#21161

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WojciechMazur merged 2 commits intolts-3.3from

Jul 11, 2024

Commits on Jul 10, 2024

Scala 2 backport: Enable parallel optimizing and writing of classes by GenBCode #6124
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Enable compilation tests using parallel backend
WojciechMazur
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