fix(spanner): wait for background goroutines to complete #10095
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As a good rule of thumb every single goroutine needs to be waited to be completed, otherwise it's easy to introduce issues where the created goroutine outlives the parent and accesses variables or services that have been shutdown.
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As a good rule of thumb every single goroutine needs to be waited to be completed, otherwise it's easy to introduce issues where the created goroutine outlives the parent and accesses variables or services that have been shutdown.