RemoteDatastoreContext should handle snapshot with groupId with older loader

[jatgarg]

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Description

RemoteDatastoreContext should handle snapshot with groupId with older loader. So, in case where we fetch the snapshot using old loader and does not have ISnapshot which contains blobContents, then that means we must have fetched the full snapshot using older format, so there is no need to evaluate in that case whether to fetch the snapshot or not.

Enable the test as it passes with odsp.

[ludwhe]

Created a PR for this : https://github.com/microsoft/sqltoolsservice/pull/2028 :smile:

[FakieHeelflip]

What about this Feature? Need this as well.