Fix order_by_optimizer_innodb and order_by_innodb tests.
The problem was that the query could be ran before InnoDB was
ready to provide a realistic statistic for #records in the table.
It provided a number that was too low, which caused the optimizer
to decide that range access plan wasn't advantageous and discard it.
Not creating explicit record locks will speed up the test.
Also, disable the use of InnoDB persistent statistics in the test of
MDEV-27270 to avoid intermittent failures in 10.6 or later
(after commit 9608773f75)
due to the nondeterministic scheduling of STATS_AUTO_PERSISTENT.
