Add migration instructions for legacy Tooltip

[connor-baer]

Relates to #2393 and #2467.

Approach and changes

• Gracefully handle envs that don't support :focus-visible
• Add migration instructions

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[changeset-bot]

⚠️ No Changeset found

Latest commit: befc0a4

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Name	Status	Preview	Comments	Updated (UTC)
oss-circuit-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 4, 2024 0:18am

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 87.69%. Comparing base (0610dd8) to head (befc0a4).

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #2480      +/-   ##
==========================================
- Coverage   87.69%   87.69%   -0.01%     
==========================================
  Files         198      198              
  Lines       21173    21182       +9     
  Branches     1276     1277       +1     
==========================================
+ Hits        18568    18575       +7     
- Misses       2553     2555       +2     
  Partials       52       52              

Files	Coverage Δ
...s/circuit-ui/components/legacy/Tooltip/Tooltip.tsx	100.00% <100.00%> (ø)
packages/circuit-ui/components/Tooltip/Tooltip.tsx	97.36% <75.00%> (-0.71%)	⬇️