Aman Agrawal 0bc0a701f8 unread_ops: Use the improved /messages/flags API to mark all as read. ...

Fixes #23406.
Fixes #14053.

This also uses the new alert banner system.

It is not clear if we want to scroll user to the end of the narrow
after this update is complete. There is a "scroll to bottom" button
for users who want to be placed at the end of the narrow but there
is no reverse option for users who don't. So, maybe not changing
the scroll position is preferred especially since we now use
banners for the update where a user could have been reading something
while we were updating the message flags in the background.

We do not handle the case of `mark as read` and `mark as unread`
both running in batches at the same (This is a somewhat rare case
given the high cap on `NUM_OF_MESSAGES_UPDATED_PER_BATCH` but
possible.).

`unread.declare_bankruptcy` is no longer used in the code but
we keep it since it is used extensively in tests.

2022-11-17 00:46:26 -08:00

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