Update a couple of blobstore params to be configurable.

Instead of hardcoding values for IDLE_JOB_PERIOD_MS and
SESSION_EXPIRY_TIMEOUT_MS, make them configurable.

Bug: 157503601
Test: atest --test-mapping apex/blobstore
Change-Id: I4846a98144224873444d4d73b2bedde258992ac4
diff --git a/tests/BlobStoreTestUtils/Android.bp b/tests/BlobStoreTestUtils/Android.bp
index 829c883..5c7c68b 100644
--- a/tests/BlobStoreTestUtils/Android.bp
+++ b/tests/BlobStoreTestUtils/Android.bp
@@ -15,6 +15,9 @@
 java_library {
   name: "BlobStoreTestUtils",
   srcs: ["src/**/*.java"],
-  static_libs: ["truth-prebuilt"],
+  static_libs: [
+    "truth-prebuilt",
+    "androidx.test.uiautomator_uiautomator",
+  ],
   sdk_version: "test_current",
 }
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