read_batch set include_deleted to false by default when reading a version

[muhammadhamzasajjad]

Fixes #1385
Similar to a normal read, batch_read now sets include_deleted to false when looking for an index key via find_index_key_for_version_id

• removed test_batch_read_metadata_multi as self._versions.items() has versions that have already been deleted, the test tries to lookup the deleted versions and tries to asserts that they are found
• removed test_batch_read_snapshot as the VersionStoreComparison creates a test sequence where it first deletes a symbol, then with test_batch_read_snapshot checks that the versions in the snapshot match the versions read with batch_read which is not the expected behaviour because deleted versions will not be returned by batch read.
• similarly removed test_batch_read_tombstoned_version_via_snapshot as, with batch_read(symbol, as_of=[version]) , we shouldn't expect to read a snapshotted version that has been deleted.

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