feat: Change Popover to use min width when matching

[benjackwhite]

Problem

Alternative to #21035

We typically want matching the width to allow overflow if necessary

Changes

• Use min width instead of width when sameWidth is true.
• Not sure how much we care about naming to make it super specific like sameWidthOrBigger

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Does this work well for both Cloud and self-hosted?

How did you test this code?

[github-actions]

Size Change: +22 B (0%)

Total Size: 824 kB

ℹ️ View Unchanged

Filename	Size	Change
frontend/dist/toolbar.js	824 kB	+22 B (0%)

_{compressed-size-action}

[Twixes]

I went through a lot of the popovers in the app and this looks great. Should actually invalidate a lot of dropdownMatchSelectWidth={false} cases, but that seems fine either way.
I agree that sameWidth is not really accurate anymore – given LemonSelect inherited the dropdownMatchSelectWidth naming from Ant, maybe matchWidth to to be a bit less strict on "same"?