fix: respect SPANNER_EMULATOR_HOST env var when autoConfigEmulator=true #2730
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The Connection API would always use the default emulator host when autoConfigEmulator=true was set in the connection string. This makes it harder to override the host name for the emulator when you also want the emulator to automatically create the instance and database that you connect to, as the only way to set it is to add it to the connection string.