RNGP - Fix build failures encounted with AGP 9.0.0-alpha05

[cortinico]

Summary:
I've been looking into the next major bump of AGP to 9:
https://developer.android.com/build/releases/agp-preview#android-gradle-plugin-built-in-kotlin

This change adapts our project so that it keeps on buildign with AGP 8
(as the bump to 9 would be a breaking change), but it addresses some of the build
failures we'll be having with AGP 9:

• Set resValues build option to true (default was changed true -> false in AGP 9)
• Configures RNTester and Helloworld to use proguard-android-optimize.txt (this is now required in AGP 9)
• Opts out our project from android.builtInKotlin and android.newDsl for the time being.

Changelog:
[Android] [Fixed] - Fix build failures with RNGP due to AGP 9.0.0-alpha05

Differential Revision: D82452555

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This pull request has been merged in 69dc655.

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This pull request was successfully merged by @cortinico in 69dc655

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