Item Resource dropdown: accessibility and layout fixes

[shinyichen]

• The tooltip was causing the dropdown menus to be no longer accessible by keyboard.
  • Move the tooltip from the menu to the icon
• Fix inconsistent menu icons size and layout

Before:

After:

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.7%. Comparing base (5a4245b) to head (43c672d).

Files with missing lines	Patch %	Lines
...mponents/ResultList/Item/ItemResourceDropdowns.tsx	89.5%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #867     +/-   ##
========================================
+ Coverage    62.7%   62.7%   +0.1%     
========================================
  Files         323     323             
  Lines       38011   38015      +4     
  Branches     1723    1725      +2     
========================================
+ Hits        23802   23815     +13     
+ Misses      14169   14160      -9     
  Partials       40      40             

Files with missing lines	Coverage Δ
...mponents/ResultList/Item/ItemResourceDropdowns.tsx	79.2% <89.5%> (+0.4%)	⬆️

... and 2 files with indirect coverage changes

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[thostetler]

LGTM