Prevent system uid component from running in an isolated app process

Similar to commit 78a3a74, but this CL is targeting on activities.

Bug: 343169511
Flag: EXEMPT bugfix
Test: locally verified via the sample app
Change-Id: Iaa7a929b73beaa076f965b3413f6a856df235ae7
diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index ff46b33..02b0bce 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -5514,7 +5514,7 @@
             final int procCount = procs.size();
             for (int i = 0; i < procCount; i++) {
                 final int procUid = procs.keyAt(i);
-                if (UserHandle.isApp(procUid) || !UserHandle.isSameUser(procUid, uid)) {
+                if (!UserHandle.isCore(procUid) || !UserHandle.isSameUser(procUid, uid)) {
                     // Don't use an app process or different user process for system component.
                     continue;
                 }