Granular progress bar in tabulate modal

[yezr]

#679 describes a new modal that provides one place for pre-tabulation checks. Part of that modal is a progress bar to indicate to users that work is being done. Initially, that progress bar will be simply bouncing back and forth to show progress while work is being done. It won't necessarily help gauge how much time is remaining.

This ticket builds on that. We know for each step how many sub-tasks are required to finish. We should use that to provide more granular progress on the progress bar.

Reading CVRs

First step is Reading CVRs (X of Y) where Y=total number of configured CVRs and X=number of those CVRs that have been parsed through. Progress bar shows X/Y.

Tabulating Round by Round Tallies

Second step is Tabulating Round by Round Tallies. Progress bar shows (Count of Candidates Elected/Eliminated)/(Total Count of Candidates)

For now, we don't call out explicitly if we are tabulating by precinct or batch. It is lumped under the Round by Round Tallies section. Do we need to separate this and call it out explicitly? Let's get started into this and revisit.