chore: Adding pip-compile-multi et al. (#10499)

* chore: Adding pip-compile-multi et al

* Specify requirements.txt path for fossa

* [ci] Fixing CI

Co-authored-by: John Bodley <john.bodley@airbnb.com>
Co-authored-by: Jesse Yang <jesse.yang@airbnb.com>

requirements/testing.in

@@ -0,0 +1,27 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+-r base.in
+-r integration.in
+flask-testing
+openapi-spec-validator
+openpyxl
+parameterized
+pylint
+pytest
+pytest-cov
+redis
+statsd