Merge pull request #10129 from nextcloud/chore/leakcanary-disabled-default

build: Disable LeakCanary unless manually activated with a property

app/build.gradle

@@ -303,7 +303,7 @@ dependencies {
         }
     }
 
-    if (!ciBuild) {
+    if (project.hasProperty("leakCanary")) {
         debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.9.1'
     }