[ci] handle when@test for doctrine

[jrushlow]

DoctrineBundle >= 2.4 Flex Recipe uses when@test in the config/packages/doctrine.yaml file instead of a separate config/packages/test/doctrine.yaml file.

Prior to this PR we were removing the test/doctrine.yaml file because we did not want to use the _test database suffix in our tests. Now we remove the dbname_suffix property if it isset in the test environment. For BC, we still remove the test/doctrine.yaml file.

We could remove then entire when@test property from doctrine.yaml, but it would probably be best to do this if something changes to the recipe in the future that warrants the removal. (Something may be added that we don't want to remove in the future as well.)

[jrushlow]

Test failures are related to MakeRegistrationTests and a flex issue specific to Symfony 4.4.

[weaverryan]

Thanks Jesse!