Performance degradation on latest version

A recent change has caused a performance degradation on loads to older MariaDb servers (below 10.2.6), which are out of support, but maybe more relevant also to mySql servers (servers that lack the MARIADB_CLIENT_STMT_BULK_OPERATIONS feature flag).

The relevant change is on clientPreparedStatement.java:
https://github.com/mariadb-corporation/mariadb-connector-j/commit/ce9b23c2413d884fdb75e5030b698ee95824bced

Maybe I'm missing the context on why this was needed, but in case this is an unintended change:

In our setup, for those servers, the flow in executeInternalPreparedBatch() would eventually call executeBatchPipeline(), now, given the change, it's calling executeBatchStd().

I didn't dig into why, but in my testing that causes a load to take substantially longer. The whole process of extracting and loading a small amount of data jumps from 8s to over 1 min with just the update from 3.5.0 to 3.5.1.

For the loading into the dabase, we are calling Statement.executeBatch()