Move ComposeContentTestRuleExt to SpaLibTestUtils

To use it in SpaTests in the future.

Bug: 259520506
Test: Unit test
Change-Id: Ic5ad78be4e04451cf317a70dfd615293565b488d
diff --git a/packages/SettingsLib/Spa/testutils/Android.bp b/packages/SettingsLib/Spa/testutils/Android.bp
index 68ad414..0f618fa 100644
--- a/packages/SettingsLib/Spa/testutils/Android.bp
+++ b/packages/SettingsLib/Spa/testutils/Android.bp
@@ -24,7 +24,10 @@
     srcs: ["src/**/*.kt"],
 
     static_libs: [
-        "mockito-target-minus-junit4",
+        "androidx.compose.ui_ui-test-junit4",
+        "androidx.compose.ui_ui-test-manifest",
+        "mockito",
+        "truth-prebuilt",
     ],
     kotlincflags: [
         "-Xjvm-default=all",