Add a personal menu dropdown that opens on clicking user avatar icon
in navbar added in previous commit.
The args passed to render_personal_menu() in onShow() are returned by
get_personal_menu_content_context() in popover_menus_data.js so that
they can be unit tested.
Additionally, added CSS to get a custom arrow for dropdown menu.
Added a `?` hotkey in keyboard shortcuts option in personal_menu
dropdown in a style similar to our tooltip's hotkey by adding
? in a span with class .tooltip-hotkey-hint and adding some CSS.
Fixes part of #22802.
This bad rendering was the result of unwanted css applied
in the stream description. In message view header, the stream
link (title) we have defined has css defined but the markdown
rendered stream link in stream description had the same class
resulting in unwanted css applied to it.
Fixes: #25961.
Signed-off-by: Akshat <akshat25iiit@gmail.com>