When messages weren't locally echoed,
`wait_for_full_processes_message` fails to assert that the message
is being sent. It was figured out by tabbott that the messages
aren't locally echoed because of content no loading completely.
So, this commit changes the `log_in` function to wait till
the selector '#zhome .message_row' is visible which indicates
that the cotent is loaded.
Removed the waitForNavigation in the `log_in` as it would
become a redundant check after this change.
Also removed this same check present in 03-compose.js which
becomes reduntant as we already do it in `log_in`.
ES and TypeScript modules are strict by default and don’t need this
directive. ESLint will remind us to add it to new CommonJS files and
remove it from ES and TypeScript modules.
Signed-off-by: Anders Kaseorg <anders@zulip.com>
