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sql: do not use raw index for count

Currently, we use raw index for count operation instead of
`box_index_count`. As a result, we skip a check if current transaction
can continue and we don't begin transaction in engine if needed. So, if
count statement is the first in a transaction, it won't be tracked by
MVCC since it wasn't notified about the transaction. The commit fixes
the mistake. Also, the commit adds a check if count was successful and
covers it with a test.

Closes #10825

NO_DOC=bugfix

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