test/cql-pytest: TestScyllaSsstableSchemaLoading: wait for ongoing compactions #13555
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The tests in this class rely on no compaction overlapping with their progress. Despite disabling auto-compaction for the scope of this test class, we still observed the very first test in the suite failing sometimes in debug mode. This is most likely a compaction started before disabling auto-compaction, which (due to the slow debug build) finishes such that it deletes the compacted sstables, right as one of the tests runs.
To prevent this, use the recently introduced tasks api to check and wait for any ongoing compaction before proceeding with the tests.
Fixes: #13553