Improve GetDatabase Caching for Firestore Function Deployments - #8681
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This is different from the pattern we use in getExistingBackend (passing the cache via Context) to avoid accidentally using a cache, but I can see arguments that the problem is less of a concern here because we're not modifying the database region between calls.
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When deploying multiple 2nd gen Firestore functions, we send many concurrent GetDatabase API requests. The existing caching mechanism was not effective for these simultaneous calls, leading to redundant requests and (potentially) API quota issue.
This change introduces caching for the promise of the GetDatabase API call itself, in addition to the result. This should improves cache hits for concurrent requests, resulting in more reliable function deployments.