changed: ensure debug logs in tests are clean
changed: ensure debug logs in tests are clean

By running all the old indice deletions before the tests, and not on a
dedicated goroutine anymore, we ensure that logs displayed after
debug.Enable() is called do not contain the old indices deletions.

l4u/algoliasearch-client-go,algolia/algoliasearch-client-go,algolia/algoliasearch-client-go,l4u/algoliasearch-client-go