[tests only] dockerutils_test TestMain should only delete existing test container #4916
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The Issue
In a recent update the logic was changed in the testMain of dockerutils_test; it may or may not have to clean up the test container, but it should use the correct test container.
I was seeing this output sometimes in tests:
[580](https://github.com/ddev/ddev/actions/runs/4990360031/jobs/8935458261?pr=4866#step:9:581)time="2023-05-16T09:50:34Z" level=error msg="-- FAIL: dockerutils_test failed to remove test container: No such container: 3578dd127b77350566d800ec43c2ac63485d8ebedcbccb5bfa4f3ce390e15bb6"