Update summary/jump icon

[alyblenkin]

Blocked by #5420

We've heard feedback that the icon isn't intuitive.

We reviewed different options as a team, but landed on the classic list icon because it's the easiest to recognize, and hopefully won't need explanation.

• Update east arrow icon with list icon .
• We are still keeping the up icon when the user is drilling down into groups or repeats.
• We will need to talk about this change in advance (maybe Insiders and a forum post).

[alyblenkin]

Adding this idea from a Collect fork here just for documentation.

It isn't well executed because it's thing and hard to see. I think the list icon is easier to understand, but this is still a nice concept to show a workflow or that you can jump from the summary view.