Don't mark terminal staged sessions as failed

Currently we mark sessions in an already-terminal state (applied
or failed) as failed when there is a build fingerprint change. This
can cause issues with trying to clean a non-existent directory.
Change this logic to check the status of the session when marking
as failed.

Test: atest StagedInstallTest
Bug: 142963471
Change-Id: I163a3c6558117455038608e15065e076e2dd82d2

services/core/java/com/android/server/pm/PackageInstallerService.java

@@ -259,7 +259,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
         // Don't hold mSessions lock when calling restoreSession, since it might trigger an APK
         // atomic install which needs to query sessions, which requires lock on mSessions.
         for (PackageInstallerSession session : stagedSessionsToRestore) {
-            if (mPm.isDeviceUpgrading()) {
+            if (mPm.isDeviceUpgrading() && !session.isStagedAndInTerminalState()) {
                 session.setStagedSessionFailed(SessionInfo.STAGED_SESSION_ACTIVATION_FAILED,
                         "Build fingerprint has changed");
             }