FI-2094: Improve tooltip a11y

[AlyssaWang]

Summary

• Added tooltips to all icons without text except in report view
• Made all such icons focusable
• Updated snackbar styles

Testing Guidance

Are there places where additional tooltip support could be added? Places where tooltip indicators would be helpful?

Notes

• Report view has custom pointer behavior that prevents tooltips on hover, they are still accessible via keyboard tab through

[codecov]

Codecov Report

Patch coverage: 65.90% and project coverage change: -0.15% ⚠️

Comparison is base (b680f84) 77.10% compared to head (f4ee922) 76.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #386      +/-   ##
==========================================
- Coverage   77.10%   76.96%   -0.15%     
==========================================
  Files         213      213              
  Lines       10510    10573      +63     
  Branches      969      972       +3     
==========================================
+ Hits         8104     8137      +33     
- Misses       1839     1867      +28     
- Partials      567      569       +2     

Flag	Coverage Δ
backend	94.51% <ø> (ø)
frontend	69.62% <65.90%> (-0.15%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...mponents/RequestDetailModal/RequestDetailModal.tsx	84.44% <0.00%> (-0.75%)	⬇️
...mponents/TestSuite/TestSuiteDetails/ResultIcon.tsx	47.22% <45.45%> (-4.11%)	⬇️
client/src/components/App/App.tsx	55.55% <81.25%> (-3.02%)	⬇️
...ite/TestSuiteDetails/TestListItem/TestListItem.tsx	69.42% <87.50%> (+0.78%)	⬆️
...uite/TestSuiteDetails/TestListItem/RequestList.tsx	76.54% <90.00%> (+0.29%)	⬆️
client/src/components/Header/Header.tsx	78.47% <100.00%> (+1.09%)	⬆️
...iteDetails/TestGroupListItem/TestGroupListItem.tsx	71.62% <100.00%> (ø)

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[mrnosal]

Tooltips visible and navigable via keyboard.