In NotificationRecord, clean out adjustments once they've been applied.

This frees up some memory and prevents unnecessary re-processing of
the adjustments.  It also deduplicates the NOTIFICATION_ASSISTANT tron
log record that is written every time a new notification is
created. It also prevents any other duplication of event logs.

Bug: 122823423
Test: atest SystemUITests NotificationAssistantServiceTest  and manual testing.
Change-Id: Ie2514e8e9ac19f79b1ad0afcde4d96649fe28069

services/core/java/com/android/server/notification/NotificationRecord.java

@@ -690,6 +690,8 @@ public final class NotificationRecord {
                                     importance));
                 }
             }
+            // We have now gotten all the information out of the adjustments and can forget them.
+            mAdjustments.clear();
         }
     }