Build system with RNTA for RN 0.73+

[CedricGuillemet]

WIP
Goals:

• use RNTA and deprecate old playgrounds
• faster builds using more splitting
• upload artifacts at different steps, for all platforms, to ease debugging
• build and test publishing for less surprises when cutting a new npm

Done :

• use a git patch to select RN and apply dependency changes.
• Split builds. with enough agents, should be <25min overall
• Test publishing (dry run) for every PR. overhead is very acceptable now
• Replace download-artifact with v4 as v2 is deprecated
• New RN versions (0.73+) will use RNTA build to produce the package. Legacy buildis kept until being replaced with deprecated versions
• Testable Windows Artifacts
• Clean up build warnings
• produce testable artifacts (ios/android apk)
• Tests with legacy build
• factorize yml so PR and publish are same processes

Issues:

• BRNPlayground build with basekit on windows: issue with dependencies in vcxproj
• windows patched versions do not build
• x86 does not build. is it still needed?
• Running produced Android artifact gives only a black screen

later:

• Use BabylonNative prebuilt (gain on Windows is <2min. unknown gain on iOS/Android)
• VisionOS

[ryantrem]

Can we do this as part of a script that is easy to run locally? Like the npm run select 0.71 we currently have?