Improve styling and behavior of multiselect of lists

[lynwilhelm]

Description

There is currently only default styling on select all and clear all affordances at the top of lists. We should define what is should be. Some thoughts are:

• Should they maybe not look like buttons at all (checkbox and styled "clear all" instead?) or should we come up with a special button style for these that have clearer meaning?
• Should "clear all" show at all before multiple are selected? Or what good styling can we provide for a disabled state? (A disabled state it does help the user discover multiselect capability)

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Below to be filled out by UX during kickoff Q&A to the best of current understanding

Size

Effort level (xs, sm, m, lg, xl)
XS

Scope

What will we do? What will we NOT do?

User needs statement(s)

As a [type of user], I need/want to [action(s)], so that I can [goal].

Additional notes

Knowns/unknowns, stakeholders, time/dependency considerations, deliverables

Examples in current UI: