[core] Fix flaky duplicate file discard test#8106
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Purpose
testDiscardDuplicateFilesMultiThreadused random commit message selection and an unbounded cached thread pool while stressing concurrent duplicate-file commits. Under CI contention, the test could exhaust the default commit retry limit and fail with anExecutionException, making the result flaky and hard to diagnose.This PR makes the test deterministic, gives the stress case a bounded retry configuration, shuts down the executor, and adds commit context to worker failures.
Tests
mvn -pl paimon-core -am -Pfast-build -DfailIfNoTests=false -Dtest=AppendOnlySimpleTableTest#testDiscardDuplicateFilesMultiThread testmvn -pl paimon-core -am -DfailIfNoTests=false -Dtest=AppendOnlySimpleTableTest#testDiscardDuplicateFilesMultiThread test