Update expand/collapse section buttons on Runs page

[salazarm]

Summary & Motivation

Updating these buttons based on the new figma design

Since SplitPanelContianer isn't a controlled component I opted to just track whether the top/bottom is expanded outside of SplitPanelContainer so that we can determine the icon / tooltip to render. I think ideally we make SplitPanelContainer a controlled component but I didn't want to change a bunch of callsites in this PR

How I Tested These Changes

locally

[github-actions]

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[github-actions]

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Built with commit eeb5dea.
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[leahpadgett]

Looks great! This might be a nit but does the tooltip normally sit above the button/icon vs to the side?

[salazarm]

Looks great! This might be a nit but does the tooltip normally sit above the button/icon vs to the side?

@leahpadgett I can put it on any side we prefer, should I move it to above?

[leahpadgett]

Looks great! This might be a nit but does the tooltip normally sit above the button/icon vs to the side?

@leahpadgett I can put it on any side we prefer, should I move it to above?

@salazarm I would say yes to be consistent with other tooltips. Thanks Marco!