Deprecate DropLab and move it into the `filtered_search` component.

1. Rename the DropLab components to DropLabDeprecated

2. Move the following files into the filtered_search component:

   • app/assets/javascripts/droplab
   • ee/app/assets/javascripts/droplab
   • spec/frontend/droplab
   • and any accompanying CSS!

3. Delete the following files:

   • doc/development/fe_guide/droplab
   • doc/development/fe_guide/droplab/droplab.md