Ensure log streams are flushed before garbage collection when using `GCFlushedOutputStream` by switching to `Cleaner`#388

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dwnusbaum wants to merge 4 commits intojenkinsci:masterfrom

dwnusbaum:fix-GCFlushedOutputStream

Commits on Mar 28, 2025

Make `GCFlushedOutputStream` work as intended by switching to `Cleaner`
dwnusbaum
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Commits on Jul 3, 2025

Merge branch 'master' into fix-GCFlushedOutputStream
dwnusbaum
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Commits on Jul 7, 2025

Add tests to LogStorageTestBase that fail without DelayBufferedOutputStream and GCFlushedOutputStream
dwnusbaum
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More consistent import ordering
dwnusbaum
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