Add conflict markers for dba tests

These tests use the same filename, and as such must not be run in
parallel.

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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