FIX Correctly clear table and reset auto increment

[GuySartorelli]

Follow-on from #11309 and #11319

We can't use the ID value as the existing implementation does, because if we created some records and then deleted them all, the max ID will be 0 or null (depending on how MySQL reads that), which means we won't reset the auto increment.

We also can't rely on fetching the current auto increment value like the original implementation did because that's cached in MySQL 8.0 which is what caused the original failure.

Instead, we just always reset the auto increment. It'll be faster than a truncate, and it's better than trying to mess with the cache settings for the table stats or running ANALYZE TABLE (which I did try but it caused other problems).

Issue

• Broken builds and merge-ups .github#290

[emteknetnz]

Closed in favor of #11334