This is also fixes the issue of chat composer warnings persisting across channels. Currently if you try to mention more groups than is allowed for example, a mention warning pops up. When you change channels the mention warning will not disappear even if there is no text in the composer.
This adds a reset function to the chat-composer-warnings-tracker.js, which is called when the channel is changed and the message is empty. In the event that the message is not empty we call captureMentions to check the loaded drafts' mentions.
This PR would be nicer if the post-send notice used the new chat notices API to publish the mention warnings but we would have to change the existing ones and I thought that would be too much change for this PR. It'd be a good followup though.
- group writes when computing separators positions
- shows skeleton only on initial load
- forces date separator to be pinned when first message to prevent a pinned - not pinned - pinned sequence when loading more in past
- relies on `message.visible` property instead of checking `isElementInViewport`
- attempts to load next/prev messages earlier
- do not scroll to on fetch more
- hides `last visit` text while pinned
First follow-up to the feature introduced in #19034. We don't want to pollute main components like `chat-live-pane`, so we'll use a service to track and manage the state needed to display before-send warnings while composing a chat message.
We also move from acceptance tests to system specs.
