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Which issue does this PR close?
Closes #6075.
Rationale for this change
Parquet writer tests can capture a delayed callback from a setup write and incorrectly report that the write under test fell back to Spark.
What changes are included in this PR?
Drain the listener bus before registering the listener and after the write using
CometListenerBusUtils.waitUntilEmpty, replacing the polling loop.How are these changes tested?
Existing writer suites pass locally on Spark 4.0.4 and 4.1.3 (50 tests each), and Spark 3.5.9 (38 passed, 11 canceled by existing version gates). Fork CI passes across Spark profiles.