dbms: Server: Removed test because UNION ALL and FORMAT cannot be reliably tested together with our current functional test framework: 1) in the result of a UNION ALL the rows may appear in any order; 2) If put UNION ALL in a subrequest and use ORDER BY, we cannot test FORMAT. [#METR-16716]

dbms: fixed error with using comparison of Date or DateTime with constant string in index [#METR-2944].