docs(flags): clarify enable-v12-dynamic-floating-styles not a sass flag

[tay1orjones]

Follow up to #17727

Changelog

New

• add enableV12DynamicFloatingStyles prop to FeatureFlag
• add tests for each FeatureFlag prop

Changed

• update storybook to clarify enable-v12-dynamic-floating-styles is a js-only flag, not a sass flag
• add enableV12DynamicFloatingStyles to telemetry config
• update snaps

Testing / Reviewing

• New tests should pass, storybook docs should render properly

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[emyarod]

it looks like there is still a snapshot update needed https://github.com/carbon-design-system/carbon/actions/runs/11523503750/job/32081668927?pr=17887

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.16%. Comparing base (75c827d) to head (ea5d089).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #17887   +/-   ##
=======================================
  Coverage   81.16%   81.16%           
=======================================
  Files         406      406           
  Lines       14046    14047    +1     
  Branches     4354     4355    +1     
=======================================
+ Hits        11400    11401    +1     
  Misses       2480     2480           
  Partials      166      166           

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[alisonjoseph]

LGTM!