feat(react-components): Add InfoButton to unstable exports

[sopranopillow]

This PR adds the following:

• Add InfoButton to unstable.
• Change react-infobutton to public.
• Update documentation to being unstable.

[size-auditor]

Asset size changes

Size Auditor did not detect a change in bundle size for any component!

Baseline commit: 9cd5e0afbd6505e57f4d3fa70c59190c0608cbb7 (build)

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit fb5e095:

Sandbox	Source
@fluentui/react 8 starter	Configuration
@fluentui/react-components 9 starter	Configuration

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	1566	1533	5000
Button	mount	1097	1129	5000
FluentProvider	mount	1893	1851	5000
FluentProviderWithTheme	mount	741	740	10
FluentProviderWithTheme	virtual-rerender	730	699	10
FluentProviderWithTheme	virtual-rerender-with-unmount	747	773	10
MakeStyles	mount	2278	2245	50000
SpinButton	mount	3017	2961	5000

[fabricteam]

📊 Bundle size report

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-components react-components: Button, FluentProvider & webLightTheme	62.951 kB 17.675 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	190.427 kB 53.087 kB
react-components react-components: FluentProvider & webLightTheme	33.456 kB 11.029 kB
react-infobutton InfoButton	117.938 kB 35.399 kB
react-portal-compat PortalCompatProvider	5.857 kB 1.978 kB

_{🤖 This report was generated against 00815ce18bbe098b1c9cd61c7f2fd04b87d1ae0d}