Rename the Firebase consumer keep rules file

The -dontwarn is still required: firebase-messaging ships no consumer rules and
we exclude firebase-analytics from its dependencies. Only rename the file to
consumer-rules.keep and reword the comment, which embedded a local path.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

libraries/pushproviders/firebase/build.gradle.kts

@@ -26,10 +26,10 @@ android {
 
     buildTypes {
         getByName("release") {
-            consumerProguardFiles("consumer-proguard-rules.pro")
+            consumerProguardFiles("consumer-rules.keep")
         }
         register("nightly") {
-            consumerProguardFiles("consumer-proguard-rules.pro")
+            consumerProguardFiles("consumer-rules.keep")
             matchingFallbacks += listOf("release")
         }
     }

libraries/pushproviders/firebase/consumer-proguard-rules.pro

@@ -1,4 +0,0 @@
-# Fix this error:
-# ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /Users/bmarty/workspaces/element-x-android/app/build/outputs/mapping/nightly/missing_rules.txt.
-# ERROR: R8: Missing class com.google.firebase.analytics.connector.AnalyticsConnector (referenced from: void com.google.firebase.messaging.MessagingAnalytics.logToScion(java.lang.String, android.os.Bundle) and 1 other context)
--dontwarn com.google.firebase.analytics.connector.AnalyticsConnector

libraries/pushproviders/firebase/consumer-rules.keep

@@ -0,0 +1,4 @@
+# firebase-messaging references AnalyticsConnector, but we exclude firebase-analytics and
+# firebase-measurement-connector from its dependencies (see build.gradle.kts), so R8 reports it as a
+# missing class.
+-dontwarn com.google.firebase.analytics.connector.AnalyticsConnector