Mila/count non lite api tests

[milaGGL]

add tests for :

• Make sure that the query property of AggregateQuery is === to the query specified to countQuery().
• Make sure that the query property of AggregateQuerySnapshot is === to the query specified to getAggregateFromServerDirect().
• count query supports collection group query
• count query supports query with a converter
• can't run count query on a terminated Firestore.
• terminate Firestore won't crash while there is flying count query

[changeset-bot]

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Latest commit: 0c2c9cc

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