Update BlobStoreMS to augment storage stats with blobs data.

- Any pending sessions data is attributed to the apps
  which contributed them.
- Any commited blobs data is attributed to the app which
  has a lease on it. If multiple apps have lease on a blob, don't
  attribute the blob to those apps for now.
- Remove StorageStatsAugmenter.augmentStatsForUser as it
  is not used for anything currently.
- Fix an issue in how we override existing committers and leasees.

Bug: 148694869
Test: atest cts/tests/BlobStore/src/com/android/cts/blob/BlobStoreManagerTest.java
Test: atest tests/tests/os/src/android/os/storage/cts/StorageStatsManagerTest.java
Test: atest hostsidetests/appsecurity/src/android/appsecurity/cts/StorageHostTest.java
Test: manual
Change-Id: Ia4af0a2549c75db66741f2d1979de95d2d150bc8
diff --git a/tests/BlobStoreTestUtils/Android.bp b/tests/BlobStoreTestUtils/Android.bp
index edd2b43..829c883 100644
--- a/tests/BlobStoreTestUtils/Android.bp
+++ b/tests/BlobStoreTestUtils/Android.bp
@@ -16,5 +16,5 @@
   name: "BlobStoreTestUtils",
   srcs: ["src/**/*.java"],
   static_libs: ["truth-prebuilt"],
-  platform_apis: true
+  sdk_version: "test_current",
 }
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