…1997)

* MM-12708: unify sign-in change redirection

Back out some of my earlier changes in MM-12680 and MM-12619 to just rely on the login controller detecting the sign in change and suppressing the session expiry.

* fix unit tests

Commit 0d02b16 (#1738) changed `.sidebar-item` to have `display: flex`, resulting in a Desktop/Electron/Chromium-specific bug that would sometimes result in an unread channel name being rendered as both bolded and not bolded.

An initial attempt at fixing this improved the behaviour some of the time, but didn't resolve the problem entirely. We've seen been able to reproduce the problem locally 100% of the time, and narrowed it down to what seems like a rendering "race" between in the CSS. It's likely this could be fixed with a larger refactor to avoid duplicate rules, but simply removing `position: relative` in this case appears to avoid the problem without any visual side effects.

* Remove flux usages from login components

* Remove flux usages from RHS posts

* Remove flux usages from popover_list_members

* Remove flux usages from webhook page

* Remove flux usages from PostTime component

* Remove flux usage from PostMarkdown component

* Remove flux usage in sidebar_right and select posts using view action

* Remove flux usages from analytics pages

* Fix style

* Select channel when focusing post

#1939)

* Fix OOO refresh logic that does not always display confirmation modal.

* Hide `Do not ask me again` checkbox for OOO.

* Add a default timezone 'America/Los_Angeles' for tests

* Change timezone to etc/UTC

Change to formateDate instead of FormatDate for testing