fix: Click outside of chart removes section selection

[Al-Dani]

Description

Ensure that after clicking outside of a chart component, highlighted segment will be cleared.

Additionally fixes discrepancy between space and enter keys behaviour for Pie chart.
It will work similarly to other charts.

Area chart behaviour will be adjusted separately.

Related links, issue #, if available: AWSUI-19991

How has this been tested?

New integration 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

Base: 92.64% // Head: 92.73% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (bb27a4c) compared to base (a331cd8).
Patch coverage: 95.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #592      +/-   ##
==========================================
+ Coverage   92.64%   92.73%   +0.09%     
==========================================
  Files         572      572              
  Lines       16447    16467      +20     
  Branches     4511     4525      +14     
==========================================
+ Hits        15237    15271      +34     
+ Misses       1133     1120      -13     
+ Partials       77       76       -1     

Impacted Files	Coverage Δ
src/mixed-line-bar-chart/chart-container.tsx	86.97% <88.88%> (+1.12%)	⬆️
src/pie-chart/pie-chart.tsx	87.42% <100.00%> (+5.28%)	⬆️
src/table/use-sticky-header.ts	82.35% <0.00%> (-3.37%)	⬇️
src/table/body-cell/index.tsx	100.00% <0.00%> (ø)
src/table/internal.tsx	97.77% <0.00%> (+0.06%)	⬆️
src/table/thead.tsx	96.42% <0.00%> (+0.35%)	⬆️
src/container/internal.tsx	91.48% <0.00%> (+0.37%)	⬆️
src/internal/components/chart-popover/index.tsx	100.00% <0.00%> (+3.33%)	⬆️
src/pie-chart/segments.tsx	97.43% <0.00%> (+7.69%)	⬆️

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