feat: add motion slots to Dialog

[layershifter]

Previous Behavior

Dialog & DialogSurface have built-in motion, but it's impossible to customize it.

New Behavior

• Dialog gets surfaceMotion slot
• DialogSurface gets backdropMotion slot

Motion slots allow to customize or replace built-in motion, see examples in #31984.

Related issues

• Fixes V9 Dialog can't trigger actions AFTER transition end #30603
• Fixes [Feature]: It would be great if the Dialog component supported a parameter like "onClose". #31129

[fabricteam]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
react-components react-components: entire library	1.095 MB 271.031 kB	1.096 MB 271.19 kB	477 B 159 B
react-dialog Dialog (including children components)	99.095 kB 29.865 kB	99.491 kB 29.895 kB	396 B 30 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-components react-components: Button, FluentProvider & webLightTheme	69.141 kB 20.157 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	211.781 kB 60.963 kB
react-components react-components: FluentProvider & webLightTheme	44.442 kB 14.607 kB
react-portal-compat PortalCompatProvider	8.39 kB 2.64 kB
react-timepicker-compat TimePicker	106.611 kB 35.546 kB

_{🤖 This report was generated against dec6f1577fe8b81810e46f92de0f7c2530e49e7e}

[fabricteam]

Perf Analysis (@fluentui/react-components)

No significant results to display.

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	626	648	5000
Button	mount	307	309	5000
Field	mount	1126	1111	5000
FluentProvider	mount	724	729	5000
FluentProviderWithTheme	mount	83	92	10
FluentProviderWithTheme	virtual-rerender	37	34	10
FluentProviderWithTheme	virtual-rerender-with-unmount	80	79	10
MakeStyles	mount	884	861	50000
Persona	mount	1788	1703	5000
SpinButton	mount	1408	1397	5000
SwatchPicker	mount	1649	1657	5000

[robertpenner]

For feature: #30700