Some files already were using `noop` in place of `() => {}`.
It's both clearer what it means and is easier to type.
This updates all test files to fully use `noop`, and
adds a shared import from the test lib file.
This should cause no functional changes.
This is part of a multi-step effort to move away
from using stream names to reference streams, now
that it's impossible for a user to write a message
with an invalid stream name (since switching to
the dropdown).
This commit moves mainly two functions from `ui.js` to `message_live_update`,
`update_message_in_all_views` and `update_starred_view`. This is done in favor of
eliminating `ui.js` and also these functions are more closely related to
`message_live_update` module than to `ui` module.
We also move `show_message_failed` and `show_failed_message_success` to `echo.js`
for cleaner seperation of responsibilities.
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>