Adds a Hilt module for test dependencies

See go/picker-test-injection

Bug: b/297021618
Test: verified that tests use deps from test module
Change-Id: Iada1f20cd69d3e7ce3d80eae3bfdfa5edc57e821
diff --git a/tests/AndroidTest.xml b/tests/AndroidTest.xml
index be2119b..18e95ef 100644
--- a/tests/AndroidTest.xml
+++ b/tests/AndroidTest.xml
@@ -22,7 +22,7 @@
     <option name="test-tag" value="ThemePickerTests" />
     <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
         <option name="package" value="com.android.wallpaper" />
-        <option name="runner" value="androidx.test.runner.AndroidJUnitRunner" />
+        <option name="runner" value="com.android.wallpaper.CustomTestRunner" />
         <option name="hidden-api-checks" value="false"/>
     </test>
 </configuration>