feat: add userSelect style equivalent to selectable

[dakshbhardwaj]

Summary

This adds support for the userSelect style attribute, mapping the already existing selectable attribute as requested on #34425. This PR also updates the TextExample.android and TestExample.ios on the RNTester in order to facilitate the manual QA of this.

Changelog

[General] [Added] - Add support for userSelect style

Test Plan

• open the RNTester app and navigate to the Text page
• Check the Selectable Text through the Selectable text section

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 12e5842
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,636,773	+133
android	hermes	armeabi-v7a	7,048,766	+133
android	hermes	x86	7,938,732	+125
android	hermes	x86_64	7,910,754	+114
android	jsc	arm64-v8a	9,513,118	+191
android	jsc	armeabi-v7a	8,288,416	+194
android	jsc	x86	9,452,660	+177
android	jsc	x86_64	10,043,906	+188

Base commit: 12e5842
Branch: main

[necolas]

Style needs to be flattened as it could be an array

[dakshbhardwaj]

@necolas i have pushed the changes

[facebook-github-bot]

@jacdebug has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @dakshbhardwaj in fc42d5b.

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