feat: Add skipVisualRefresh option in initThemes

[YueyingLu]

Description of changes:

Add skipVisualRefresh option to initThemes() to support one-theme in the vr-only artifact.

Problem

The vr-only artifact (setting ALWAYS_VISUAL_REFRESH=true) short-circuits useVisualRefresh to () => true, so useRuntimeVisualRefresh and initThemes() never run. This means the awsui-one-theme body class is never applied even when the global flag is set.

Solution

initThemes() now accepts an optional { skipVisualRefresh?: boolean } parameter. When true, it skips adding awsui-visual-refresh but still applies other theme.

The components package will call initThemes({ skipVisualRefresh: ALWAYS_VISUAL_REFRESH }) from useBaseComponent to ensure theme classes are applied regardless of the ALWAYS_VISUAL_REFRESH flag. See this PR cloudscape-design/components#4894

Test

Add unit test and will add integration test internally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.09%. Comparing base (27ee76f) to head (fe3e9de).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #246   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files          56       56           
  Lines        1784     1787    +3     
  Branches      519      517    -2     
=======================================
+ Hits         1750     1753    +3     
  Misses         33       33           
  Partials        1        1           

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