Add experimental flag, that partially disables loading phase (pattern evaluation, test_suite expansion and configuration creation is still there). Also remove some unused code.

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MOS_MIGRATED_REVID=103177839
diff --git a/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java b/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java
index b051db1..bb9bf22 100644
--- a/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java
+++ b/src/test/java/com/google/devtools/build/lib/analysis/AspectTest.java
@@ -174,4 +174,14 @@
     assertThat(a.getProvider(TestAspects.RuleInfo.class).getData())
         .containsExactly("rule //a:a", "aspect //a:b data hello");
   }
+
+  @RunWith(JUnit4.class)
+  public static class AspectTestWithoutLoading extends AspectTest {
+    @Override
+    @Before
+    public void setUp() throws Exception {
+      disableLoading();
+      super.setUp();
+    }
+  }
 }