Add test spec provider to test modules.

Provider added for the following test modules in this change: art_cc_test, cc_benchmark, cc_fuzz, cc_test, cc_test_host, rust_test,and rust_test_host.

Bug: 296873595
Test: Manual test
Change-Id: I815680529bcbecacb3a2bdb8f3746053afdee48c
diff --git a/cc/Android.bp b/cc/Android.bp
index 8fa0fbe..77e96db 100644
--- a/cc/Android.bp
+++ b/cc/Android.bp
@@ -19,6 +19,7 @@
         "soong-multitree",
         "soong-snapshot",
         "soong-sysprop-bp2build",
+        "soong-testing",
         "soong-tradefed",
     ],
     srcs: [