* Revert "fix: multiselect validation (#7698)"

This reverts commit 728a2559c55fa4da4c12f3087e8e05b3bb20705a.

* - Convert the multiselect options value and labels to string before filtering as the values can be numbers.

* - Discourage users from using string in multiselect default value

Co-authored-by: Satish Gandham <satish@appsmith.com>
(cherry picked from commit c3d5b1010bf3185da71fa10d6c38696e318c719d)