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 :

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

Issues:

• [x] 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