popovers: Hide when starting certain actions.

These are actions which can be called when a popover is open and
it is better to close the popover when these actions are
initiated.

web/tests/compose_actions.test.js

@@ -58,6 +58,9 @@ mock_esm("../src/message_lists", {
 mock_esm("../src/resize", {
     reset_compose_message_max_height: noop,
 });
+mock_esm("../src/popovers", {
+    hide_all: noop,
+});
 
 const people = zrequire("people");