fix: Fix line numbers misalignment with single-line content when actions are provided

[avinashbot]

Description

We add a min height to the content when actions aren't provided, but we don't add that min height to the line numbers container, so it doesn't match. This happens with both themes.

Related links, issue #, if available: AWSUI-58645

How has this been tested?

Added a screenshot test for line numbers and actions.

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.

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 100.00%. Comparing base (d4475dc) to head (77f7e79).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #43   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           27        27           
  Lines          345       348    +3     
  Branches        30        31    +1     
=========================================
+ Hits           345       348    +3     

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