SQLStore: Fix folder migration for MySQL < 5.7 (#62521)
* Nested folders: Do not skip integration tests
* SQLStore: Fix folder migration
It reduces the length of the title column to be equal with the respective
dashboard column.
(cherry picked from commit 4eaff63eda)
Co-authored-by: Sofia Papagiannaki <1632407+papagian@users.noreply.github.com>