Parametrize DRA test config

[emerbe]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

This PR modifies DRA test logic a bit so it's parametrized to simplify running test with different drivers and with different scale.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: emerbe
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[emerbe]

/assign @alaypatel07