[0.74] Fixes build from source on Android (#43616)

* fix(android): fix `ndkVersion` is unset when building from source (#43131)

Summary:
`ndkVersion` is unset when building from source using this guide: https://reactnative.dev/contributing/how-to-build-from-source

## Changelog:

[ANDROID] [FIXED] - Fix `ndkVersion` is unset when building from source

Pull Request resolved: https://github.com/facebook/react-native/pull/43131

Test Plan:
```
git clone https://github.com/microsoft/react-native-test-app.git
cd react-native-test-app
npm run set-react-version nightly
yarn

# Manually apply the patch in node_modules/react-native/ReactAndroid/build.gradle.kts
# Enable building from source
sed -i '' 's/#react.buildFromSource/react.buildFromSource/' example/android/gradle.properties

# Build
cd example/android
./gradlew assembleDebug
```

Reviewed By: christophpurrer

Differential Revision: D54006425

Pulled By: cortinico

fbshipit-source-id: 9ede64bc14af4cf609b7a4c12c5a1082bbc31f09

* Fix build from source for hermes-engine (#43609)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43609

When users are building from source for React Native they don't have an ndkVersion variable specified. So we want to fallback to the global NDK version we set for the whole build here.

Changelog:
[Android] [Fixed] - Fix build from source for hermes-engine

Reviewed By: dmytrorykun

Differential Revision: D55240603

fbshipit-source-id: 3c725a164b40e176548af8ada9fcb13d391ef017

---------

Co-authored-by: Tommy Nguyen <4123478+tido64@users.noreply.github.com>

packages/react-native/ReactAndroid/build.gradle.kts

@@ -488,6 +488,8 @@ android {
   }
   if (rootProject.hasProperty("ndkVersion") && rootProject.properties["ndkVersion"] != null) {
     ndkVersion = rootProject.properties["ndkVersion"].toString()
+  } else {
+    ndkVersion = libs.versions.ndkVersion.get()
   }
 
   compileOptions {

packages/react-native/ReactAndroid/hermes-engine/build.gradle.kts

@@ -192,6 +192,8 @@ android {
   }
   if (rootProject.hasProperty("ndkVersion") && rootProject.properties["ndkVersion"] != null) {
     ndkVersion = rootProject.properties["ndkVersion"].toString()
+  } else {
+    ndkVersion = libs.versions.ndkVersion.get()
   }
 
   defaultConfig {