Update search box debounce in the Admin UI

[seanpreston]

There is a debounce on line 35. I do agree maybe we increase the milliseconds from 250 to 500 and have a minimum character limit of 2. Your thoughts?

Originally posted by @chriscalhoun1974 in #1099 (comment)

NB. We should be sure that the debounce time is consistent across all UI search elements.

[chriscalhoun1974]

@seanpreston The debounce value is 250 milliseconds throughout the Admin UI web application. In regards to the minimum 2 character limit for the search, we can discuss further with the team if you like.