refactor(Popover)!: remove showArrow from popover

[booc0mtaco]

Summary:

• after discussion with design, will remove the example showing the (already deprecated) showArrow prop

Test Plan:

• update test snapshots

[codecov]

Codecov Report

Merging #1461 (f824514) into next (b77e354) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             next    #1461      +/-   ##
==========================================
- Coverage   91.74%   91.73%   -0.01%     
==========================================
  Files         293      293              
  Lines        4359     4355       -4     
  Branches      779      777       -2     
==========================================
- Hits         3999     3995       -4     
  Misses        333      333              
  Partials       27       27              

Impacted Files	Coverage Δ
src/components/Popover/Popover.stories.tsx	87.50% <ø> (-0.50%)	⬇️
src/components/Popover/Popover.tsx	94.59% <ø> (-0.41%)	⬇️

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[ghost]

Should the showArrow prop be removed as well?

Edit: actually you're probably keeping that prop for functionality until it is completely removed

[jinlee93]

Honestly, I think it would be ok to axe the showArrow prop and the couple usages in the recipes, since it's not being used downstream

[booc0mtaco]

that's fair. in fact, our 8.0 will mostly be trimming away components/props, so we can capture that in the next release and avoid creating a 9.0 JUST for this prop removal