This commit adds code to add "(guest)" to user names of guest
users in the following places -
- right sidebar
- user pills, including the pills in search suggestion typehaead
- typeaheads for user
- sender names in message feed
- user profile popover and modals.
- user name in not subscribed warning banner.
Note that the indicator is shown only if enable_guest_user_indicator
setting is set to true.
As a result of this change, we now translate "deactivated" text
shown in user pills for deactivated users.
Fixes part of #26700.
Specifically when it's the last operand of the search
filter. This makes the first line of search results
more consistent with the lines that come after.
This in-progress feature was started in 2018 and hasn't
been worked on much since. It's already in a broken state,
which makes it hard to iterate on the existing search bar
since it's hard to know how those changes will affect search
pills.
We do still want to add search pills eventually, and when
we work on that, we can refer to this diff to readd the
changes back.