Add code coverage

[snowystinger]

Lets see what we're at and if this works :)

Closes

✅ Pull Request Checklist:

• Included link to corresponding Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Team:

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[codecov]

Codecov Report

Merging #228 into master will decrease coverage by 0.02%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##           master     #228      +/-   ##
==========================================
- Coverage   69.55%   69.52%   -0.03%     
==========================================
  Files         206      206              
  Lines        3961     3961              
  Branches      839      841       +2     
==========================================
- Hits         2755     2754       -1     
  Misses        625      625              
- Partials      581      582       +1

Impacted Files	Coverage Δ
...s/@react-spectrum/menu-trigger/src/MenuTrigger.tsx	93.33% <ø> (ø)	⬆️
packages/@react-aria/menu-trigger/src/useMenu.ts	72.72% <ø> (ø)	⬆️
...ckages/@react-spectrum/menu-trigger/src/context.ts	100% <ø> (ø)	⬆️
packages/@react-spectrum/menu-trigger/src/Menu.tsx	85.71% <ø> (+0.52%)	⬆️
...ges/@react-aria/menu-trigger/src/useMenuTrigger.ts	91.3% <100%> (+0.39%)	⬆️
...eact-aria/selection/src/useSelectableCollection.ts	52% <75%> (+3.13%)	⬆️

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