feat(react-select): Adding optional shadows to filled appearances

[sopranopillow]

Related Issue(s)

Fixes #24642

[fabricteam]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
react-select Select	20.846 kB 7.346 kB	21.005 kB 7.383 kB	159 B 37 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	187.939 kB 52.05 kB
react-components react-components: FluentProvider & webLightTheme	33.394 kB 11.007 kB
react-portal-compat PortalCompatProvider	5.851 kB 1.964 kB

_{🤖 This report was generated against 17b9063802b28bf7f4b1c4d439623819ad8940fa}

[codesandbox-ci]

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

[size-auditor]

Asset size changes

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

Baseline commit: 17b9063802b28bf7f4b1c4d439623819ad8940fa (build)

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	1676	1608	5000
Button	mount	1176	1176	5000
FluentProvider	mount	2013	1945	5000
FluentProviderWithTheme	mount	723	726	10
FluentProviderWithTheme	virtual-rerender	668	682	10
FluentProviderWithTheme	virtual-rerender-with-unmount	736	726	10
MakeStyles	mount	2301	2335	50000
SpinButton	mount	3265	3205	5000

[smhigley]

Approved, but same comment as in combobox -- I can't see the shadow at all in the appearance variant example. Do we have an example of where this appearance variant should be used in a way that is still accessible?