fix: Container overflow constrained to the content slot

[pan-kot]

Description

Fixes scrollable area in container which affects the placement of table sticky scrollbar.

Rel: AWSUI-54814

How has this been tested?

• New integ test
• Screenshot tests
• Dry-run

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 96.20%. Comparing base (4220993) to head (54e9b8c).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2864      +/-   ##
==========================================
- Coverage   96.20%   96.20%   -0.01%     
==========================================
  Files         761      761              
  Lines       21453    21453              
  Branches     6944     6944              
==========================================
- Hits        20639    20638       -1     
- Misses        806      807       +1     
  Partials        8        8              

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