fix(protocol-designer): fix scroll position of MoreOptionsModal

[IanLondon]

Overview

Closes #6156

Changelog

• refactor all places I could find in PD where we do element.scrollToTop = 0 to use a common util
• fix scroll of MoreOptionsModal

Review requests

I found there were 2 ways of doing the same thing for the scroll to top behavior, and a lot of repeated code for it, so I factored it out to a new resetScrollElements util. The comment about the old issue #4446 still stands, but IMO probably not a priority to address that until we do larger styling changes to PD one day. (Agree/disagree?)

Since I did that refactor, we should double-check the scroll behavior of several elements. To check, scroll down as far as you can while still keeping the button you need in view, and ensure that the dark gray modal overlay fills the main panel (instead of weirdly only partially filling it)

• The one the issue bug: PD "Notes" modal can appear off-screen and you can't scroll to it #6156 is actually for: MoreOptionsModal (click "NOTES" button in a step form)
• BrowseLabware modal (open a step form so you can scroll down, and click "View Liquids" on a labware on the deck)
• edit pipette modal
• add/edit module modal
• file export warning modals
• experimental settings warning modal
• selecting a step should still scroll to top (via select step thunk)

Risk assessment

Low, at worst could mess up scroll behaviors of other modals

[shlokamin]

thanks for getting rid of the repeated code!