Use the LoadBalancer id in flushPrimarySessions(), not the LBFactory one,
and use assertOwnership() to check $owner, similar to other methods.
In DatabaseMysqlBase::doFlushSession(), change RELEASE_ALL_LOCKS() query
to use RELEASE_LOCK(), since only newer MariaDB versions (>=10.5.2) support
it. No errors were thrown in the method since they are suppressed, but the
syntax error would cause the transaction to be placed in an error state.
Add assertion to testTransactionCallbackChains() that would otherwise fail.
Randomize lock names in lock() tests to avoid contention.
Bug: T292239
Bug: T303887
Follow-Up: ee3c65d541
Follow-Up: 4cac31de4e
Change-Id: I414d737028338cfd5369eee24576df4aa26a2f6f
eed58f2f61