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Remove unnecessary dependency on statement_timeout in prepared_xacts …
…test. Rather than waiting around for statement_timeout to expire, we can just try to take the table's lock in nowait mode. This saves some fraction under 4 seconds when running this test with prepared xacts available, and it guards against timeout-expired-anyway failures on very slow machines when prepared xacts are not available, as seen in a recent failure on axolotl for instance. This approach could fail if autovacuum were to take an exclusive lock on the test table concurrently, but there's no reason for it to do so. Since the main point here is to improve stability in the buildfarm, back-patch to all supported branches.
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