Improve DBA test suite (#8904)

Generalises tests for all the different drivers.
Run the general test for the various drivers.

This allows support for parallel testing as the tes

Improve DBA test suite (#8904)

Generalises tests for all the different drivers.
Run the general test for the various drivers.

This allows support for parallel testing as the tests now do not rely on the same DB file.

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DBA should not convert elements in-place if the key param is an array

Also check that the value can actually be converted to string