Remove script used for test migration (#955)

Remove script used for test migration

I wrote this years ago to migrate tests in AWX that needed to be ported into ansible-runner. They have diverged significantly since then and it wouldn't be viable to re-run this.

Reviewed-by: Alexander Sowitzki <dev@eqrx.net>
Reviewed-by: David Shrewsbury <None>
Reviewed-by: None <None>