Long data source names are not being shown properly in the search filters' UI

[DementevNikita]

trafficstars

Needs to do select-menu width variable - by width of the content. With min-width (like current select-menu width), and max-width by design. If text inside menu longer than max-width - truncate it.

[nstkvl]

Still see differences between design and realization

[Leshe4ka]

New design solution for tall select menus on the small screens