Fix account provider change on nightly and release (#861)

* Use parallelMap (same code)

* Add proguard rules. Fixes #818

* Rename file proguard-rules.pro to consumer-rules.pro for coherency.

* Remove empty and non-referenced proguard files.

libraries/designsystem/build.gradle.kts

@@ -30,7 +30,7 @@ android {
     buildTypes {
         getByName("release") {
             isMinifyEnabled = true
-            consumerProguardFiles("proguard-rules.pro")
+            consumerProguardFiles("consumer-rules.pro")
         }
     }