Shows a stream info popover whenever a channel pill is clicked (such
as in the pill widgets for adding subscribers to a channel or
invitations). The stream info popover contains channel icon and name,
channel description and a link to channel settings.
Fixes#30567.
This commit is part of a bigger project to remove custom logic in
the input_pill module. This commit move us away from a world where
we have a `display_value` that's used as identifying information
for a pill as well as for what we display to the user. Now individual
widgets can configure how they come up with a display value based
on the data of that type of pill.
Note: The change in the stream pill test for setting subscribers
for denmark is fixing an issue that wasn't discoverable before.
There always should have been three subscribers.
This lets us simplify the long-ish ‘../../static/js’ paths, and will
remove the need for the ‘zrequire’ wrapper.
Signed-off-by: Anders Kaseorg <anders@zulip.com>