(Dispatch page) Display all jobs and allow dispatcher to select the jobs he/she would like to see

This is the top of the dispatch page. The user should be able to see all the jobs that could be displayed and use a checkbox to indicate the jobs he/she would like to see.

Start by locating the dispatch page and its current job-list rendering. Review how available jobs are loaded and displayed, then define completion as showing all displayable jobs with a checkbox for each and updating the visible selection accordingly; no specific files or tests are named in the issue.

Written by the indexing model from the issue text.