Update BlobStorePerfTests to use releaseAllLeases().

Earlier, we were clearing package data which has a
side effect of the package under instrumentation getting
killed.

Bug: 227589710
Test: atest ./apct-tests/perftests/blobstore/src/com/android/perftests/blob/BlobStorePerfTests.java
Change-Id: I6c43c4404939a8b7c35b2214ff2460f6513f08ba

apct-tests/perftests/blobstore/src/com/android/perftests/blob/BlobStorePerfTests.java

@@ -95,9 +95,9 @@ public class BlobStorePerfTests {
     }
 
     @After
-    public void tearDown() {
+    public void tearDown() throws Exception {
         mContext.getFilesDir().delete();
-        runShellCommand("cmd package clear " + mContext.getPackageName());
+        mBlobStoreManager.releaseAllLeases();
         runShellCommand("cmd blob_store idle-maintenance");
     }