Use secret Sentry DSN value (#4210)

* Use secret Sentry DSN value.

We realised our DSN entry has been shipped along with the code and it was being used in several forks as is, resulting in wrong bug reports coming into our Sentry dashboard and making it very hard to debug actual issues in the app.

plugins/src/main/kotlin/extension/Utils.kt

@@ -13,6 +13,7 @@ import org.gradle.api.provider.ValueSourceParameters
 import org.gradle.process.ExecOperations
 import java.io.ByteArrayOutputStream
 import java.io.IOException
+import java.util.Properties
 import javax.inject.Inject
 
 abstract class GitRevisionValueSource : ValueSource<String, ValueSourceParameters.None> {
@@ -47,3 +48,10 @@ private fun ExecOperations.runCommand(cmd: String): String {
     }
     return String(outputStream.toByteArray()).trim()
 }
+
+fun Project.readLocalProperty(name: String): String? = Properties().apply {
+    try {
+        load(rootProject.file("local.properties").reader())
+    } catch (ignored: IOException) {
+    }
+}.getProperty(name)