After adding new tests, the source code of tst_concurrentmap
grows rapidly with copy/paste/replace pattern.
This intoduce the issue with maintaining the test.
Get rid of separate functions for testing blocking versions
of mapped/mappedReduced and test blocking versions in parallel
with non-blocking flavors. So again, get rid of duplicated code.
Task-number: QTBUG-83258
Change-Id: I4cac6f4e1bfd1b50363dc094610717674aebf2af
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>