chore(react-alert): adopt custom JSX pragma

[bsunderhus]

New Behavior

1. Adopts react-jsx-runtime custom pragma on react-alert
2. adds resolveShorthand to all slots (some root slots were missing it)

[codesandbox-ci]

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Latest deployment of this branch, based on commit 416e7fc:

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: bb758eb9091e5c53f8d1d58baf50505aa2aa34cc (build)

[fabricteam]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
react-alert Alert	95.877 kB 23.104 kB	96.657 kB 23.331 kB	780 B 227 B

Unchanged fixtures

Package & Exports	Size (minified/GZIP)
react-components react-components: Button, FluentProvider & webLightTheme	68.093 kB 18.424 kB
react-components react-components: Accordion, Button, FluentProvider, Image, Menu, Popover	207.629 kB 57.6 kB
react-components react-components: FluentProvider & webLightTheme	38.833 kB 12.37 kB
react-portal-compat PortalCompatProvider	6.446 kB 2.185 kB

_{🤖 This report was generated against 2e1cf8928df3e4f0b64b7390408374db94ae9e2c}

[fabricteam]

Perf Analysis (@fluentui/react-components)

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
InfoButton	mount	26	20	5000	Possible regression

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	696	706	5000
Button	mount	396	411	5000
Field	mount	1258	1253	5000
FluentProvider	mount	776	759	5000
FluentProviderWithTheme	mount	107	106	10
FluentProviderWithTheme	virtual-rerender	88	95	10
FluentProviderWithTheme	virtual-rerender-with-unmount	100	101	10
InfoButton	mount	26	20	5000	Possible regression
MakeStyles	mount	1189	1193	50000
Persona	mount	1958	1923	5000
SpinButton	mount	1481	1495	5000

[bsunderhus]

I'll be waiting for #27571 before merging this PR