Add a test class validator to ravenizer

For now, just detect tests extending legacy base class, but just show
warnings.

Flag: EXEMPT host test change only
Bug: 292141694
Test: m $( frameworks/base/ravenwood/scripts/list-ravenwood-tests.sh )
    and manually check the output
Change-Id: I689b97129c655f5feee3ce789477f493e995b853
diff --git a/ravenwood/scripts/remove-ravenizer-output.sh b/ravenwood/scripts/remove-ravenizer-output.sh
new file mode 100755
index 0000000..be15b71
--- /dev/null
+++ b/ravenwood/scripts/remove-ravenizer-output.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+# Copyright (C) 2024 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Delete all the ravenizer output jar files from Soong's intermediate directory.
+
+# `-a -prune` is needed because otherwise find would be confused if the directory disappears.
+
+find "${ANDROID_BUILD_TOP:?}/out/soong/.intermediates/" \
+    -type d \
+    -name 'ravenizer' \
+    -print \
+    -exec rm -fr \{\} \; \
+    -a -prune