[Popover] Enable floating autoupdate only when open

[axelhzf]

Closes #21026

Instead of relaying on the whileElementsMounted property, this code calls autoUpdate only when the Popover is open.

Changelog

Changed

• Optimize Popover performance during resize events with multiple components on page

Testing / Reviewing

• Create a page with many components that include Carbon tooltips using autoAlign (e.g., 100+ tooltips)
• Resize the window
• Observe the page performance

PR Checklist

As the author of this PR, before marking ready for review, confirm you:

• Reviewed every line of the diff
• Updated documentation and storybook examples
• Wrote passing tests that cover this change
• Addressed any impact on accessibility (a11y)
• Tested for cross-browser consistency
• Validated that this code is ready for review and status checks should pass

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[axelhzf]

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[axelhzf]

recheck

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.39%. Comparing base (a4172c3) to head (d96a49f).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #21028   +/-   ##
=======================================
  Coverage   92.38%   92.39%           
=======================================
  Files         515      515           
  Lines       37629    37634    +5     
  Branches     5738     5770   +32     
=======================================
+ Hits        34765    34771    +6     
+ Misses       2715     2713    -2     
- Partials      149      150    +1     

Flag	Coverage Δ
main-packages	85.57% <100.00%> (+<0.01%)	⬆️
web-components	96.66% <ø> (+<0.01%)	⬆️

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