Virtualizer: Update IO/Timer to use Fluent hooks

[Mitch-At-Work]

Previous Behavior

Used native IO and timer functions

New Behavior

Uses equivalent Fluent hooks.

Related Issue(s)

• Fixes [Virtualizer]: use useTimeout() instead of setTimeout() #31095
• Fixes [Virtualizer]: update useIntersectionObserver() to get the global object from context #31096

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	623	619	5000
Button	mount	302	326	5000
Field	mount	1123	1137	5000
FluentProvider	mount	715	704	5000
FluentProviderWithTheme	mount	77	84	10
FluentProviderWithTheme	virtual-rerender	35	38	10
FluentProviderWithTheme	virtual-rerender-with-unmount	78	83	10
MakeStyles	mount	860	858	50000
Persona	mount	1782	1753	5000
SpinButton	mount	1448	1379	5000
SwatchPicker	mount	1550	1525	5000

[codesandbox-ci]

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[fabricteam]

📊 Bundle size report

✅ No changes found