Previously, set_muted_topics was calling update_unread_counts once for each
topic in the input; this results in poor performance when there is a large
number of muted topics.
Fixes: #3605
* In most cases, eslint --fix with the right comma-dangle settings was
able to update the code correctly.
* The exceptions were cases where the parser incorrectly treated the
arguments to functions like `assert_equal` as arguments; we fixed
these manually. Since this is test code, we can be reasonably
confident that just fixing the failures suffices to correct any bugs
introduced by making changes automatically.
Elliott Jin
Tim Abbott
Kartik Maji
Tim Abbott