Automatically scroll to the last comment in some links

[jannes-io]

What problem would you like to solve?
When going to a topic from notifications, email, or the "last comment by" on the forum overview, you should automatically go to the last page of comments in the topic, and the last comment should be scrolled into view.

Additional context
We already have the lastPageFirst property that allows us to go to the last page, we just need to expose this through the url and scroll the comment into view.

Then in the following places, use the new parameter:

• In new comment emails
• In the notifications (I think this is the same link as the email?)
• In the "last comment by" on the forum
• After creating a new comment

[jannes-io]

Pages where the comment list isn't the only list on the page are now also affected, since the url params are global and every abstract list uses the same param names...

So a possible solution was to add a prefix to those lists where it mattered. But we can't add prefixes, we can only override the entire query. Fixing this would require us to implement the modifier on every component individually instead of keeping it all to the AbstractList. An issue was created in symfony ux that would simplify this a lot: symfony/ux#2650