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.

features/location/api/build.gradle.kts

@@ -5,20 +5,13 @@
  * Please see LICENSE files in the repository root for full details.
  */
 
-import java.util.Properties
+import extension.readLocalProperty
 
 plugins {
     id("io.element.android-compose-library")
     id("kotlin-parcelize")
 }
 
-fun readLocalProperty(name: String): String? = Properties().apply {
-    try {
-        load(rootProject.file("local.properties").reader())
-    } catch (ignored: java.io.IOException) {
-    }
-}.getProperty(name)
-
 android {
     namespace = "io.element.android.features.location.api"