fix: Add role="tooltip" to non-modal chart popovers

[avinashbot]

Description

Pretty simple and direct, should filter down to both the old and the new charts.

Related links, issue #, if available: AWSUI-61648

How has this been tested?

Unit tests.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.18%. Comparing base (ed20611) to head (be28604).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4222   +/-   ##
=======================================
  Coverage   97.18%   97.18%           
=======================================
  Files         883      883           
  Lines       25869    25870    +1     
  Branches     9345     9346    +1     
=======================================
+ Hits        25140    25141    +1     
  Misses        723      723           
  Partials        6        6           

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