chore(react-tree): adopt custom JSX pragma

[bsunderhus]

New Behavior

1. Adopts react-jsx-runtime custom pragma on react-tree
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 80139da:

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

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	20	20	5000	Possible regression

All results

Scenario	Render type	Master Ticks	PR Ticks	Iterations	Status
Avatar	mount	705	720	5000
Button	mount	396	405	5000
Field	mount	1252	1244	5000
FluentProvider	mount	783	775	5000
FluentProviderWithTheme	mount	107	107	10
FluentProviderWithTheme	virtual-rerender	96	96	10
FluentProviderWithTheme	virtual-rerender-with-unmount	104	100	10
InfoButton	mount	20	20	5000	Possible regression
MakeStyles	mount	1181	1205	50000
Persona	mount	1975	1926	5000
SpinButton	mount	1481	1512	5000

[bsunderhus]

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