RNGP: Read enableWarningsAsErrors property correctly (#46657)

Summary:
I've noticed that some users are reporting build failures due to warnings inside RNGP.
We do have `allWarningsAsErrors` set to true for everyone (also for users).
That's too aggressive, and can cause build failures which are not necessary. Let's keep it enabled only on our CI (when the `enableWarningsAsErrors` property is set).

## Changelog:

[INTERNAL] - RNGP: Read `enableWarningsAsErrors` property correctly

Pull Request resolved: https://github.com/facebook/react-native/pull/46657

Test Plan: CI

Reviewed By: NickGerleman

Differential Revision: D63459601

Pulled By: cortinico

fbshipit-source-id: 0307e8d6771518038a5abe27ca5a993cb0a9f8c0

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

@@ -64,7 +64,8 @@ tasks.withType<KotlinCompile>().configureEach {
     apiVersion = "1.6"
     // See comment above on JDK 11 support
     jvmTarget = "11"
-    allWarningsAsErrors = true
+    allWarningsAsErrors =
+        project.properties["enableWarningsAsErrors"]?.toString()?.toBoolean() ?: false
   }
 }
 

packages/gradle-plugin/settings-plugin/build.gradle.kts

@@ -54,7 +54,8 @@ tasks.withType<KotlinCompile>().configureEach {
     apiVersion = "1.6"
     // See comment above on JDK 11 support
     jvmTarget = "11"
-    allWarningsAsErrors = true
+    allWarningsAsErrors =
+        project.properties["enableWarningsAsErrors"]?.toString()?.toBoolean() ?: false
   }
 }
 

packages/gradle-plugin/shared-testutil/build.gradle.kts

@@ -24,7 +24,8 @@ tasks.withType<KotlinCompile>().configureEach {
   kotlinOptions {
     apiVersion = "1.6"
     jvmTarget = "11"
-    allWarningsAsErrors = true
+    allWarningsAsErrors =
+        project.properties["enableWarningsAsErrors"]?.toString()?.toBoolean() ?: false
   }
 }
 

packages/gradle-plugin/shared/build.gradle.kts

@@ -30,7 +30,8 @@ tasks.withType<KotlinCompile>().configureEach {
   kotlinOptions {
     apiVersion = "1.6"
     jvmTarget = "11"
-    allWarningsAsErrors = true
+    allWarningsAsErrors =
+        project.properties["enableWarningsAsErrors"]?.toString()?.toBoolean() ?: false
   }
 }