Enable Sentry in the SDK: add SDK Sentry DSN value

This is provided to the SDK in `PlatformInitializer`.

services/analyticsproviders/sentry/build.gradle.kts

@@ -32,6 +32,16 @@ android {
             }
                 ?: ""
         )
+        buildConfigFieldStr(
+            name = "SDK_SENTRY_DSN",
+            value = if (isEnterpriseBuild) {
+                BuildTimeConfig.SERVICES_SENTRY_SDK_DSN
+            } else {
+                System.getenv("ELEMENT_SDK_SENTRY_DSN")
+                    ?: readLocalProperty("services.analyticsproviders.sdk.sentry.dsn")
+            }
+                ?: ""
+        )
     }
 }