Let Runtime.gc schedule finalization of system resources

[JaroslavTulach]

Pull Request Description

• we have concept of system managed resources since
  • Enhance Managed_Resource to allow implementation of in-memory caches #11577
  • it has been used by @GregoryTravis in Clear cache on reload #11673 & co.
• however we are missing a way to explicitly invoke the clean up from test/*_Test
• this PR proposes to do the cleanup when calling Runtime.gc
• by doing this we could unify for example CloudAPI.flushCloudCaches code
  • used here and here
  • a code that was using a lot of problems in Run Standard.Snowflake in dual JVM mode #14474 Audit.Logs tests
  • the CloudAPI caches would become system resources
  • and simple call to Runtime.gc would release them before performing tests that require clean caches
• opinions?

Important Notes

Checklist

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• The documentation has been updated, if necessary.
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[jdunkerley]

Seems a reasonable approach - should we maybe make it explicit.
I.e. add an optional argument flush_caches:Boolean=False

[JaroslavTulach]

make it explicit. I.e. add an optional argument flush_caches:Boolean=False

• done in 349b713
• making it explicit is certainly more compatible change