[CosmosDB] Add database account operations tests#15189

Merged

YalinLi0312 merged 5 commits intoAzure:masterfrom

YalinLi0312:dev-cosmosdb

Sep 17, 2020

Commits on Sep 16, 2020

Add database account operations tests and it's recording file
YalinLi0312
committed

Commits on Sep 17, 2020

Split the CRUD test to small unit tests
YalinLi0312
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Update recordings
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Make long lines shorter and remove an extra empty line
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Fix a potential deadlock in CheckNameExistsAsync
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