Release memory/Clear internal gradle cache

[luepges]

• SharedQueueService: Release classloader memory by clearing internal gradle caches after isolation
• Use Gradle's VisitableURLClassLoader to avoid the global classcache
• SharedQueueService: Reduce min workers to 2 (as GitHub actions start with 512 MB hby default)

[github-actions]

✔️ Changes pass the MontiVerse

Project	Status

details

Project	Status
montiarc	✅
umlp_experiments	✅
umlp_tool	✅
sd	✅
montifun	✅
fd	✅
automaton	✅
sc	✅
guidsl	✅
artifacts	✅
ocl	✅
od	✅
ucd	✅
langexperiments	✅
json	✅
xml	✅
cd2gui	✅
mlc	✅
cd4analysis	✅
monticore_basic	✅

The MontiVerse is a collection of (internal and public) language projects.

[luepges]

Still not a fan of this workaround.
I'll try to upstream parts of this to Gradle, so we have an exposed API and can get rif of this reflection usage