Overhaul additional sanity tests. (#36803)

* Remove unnecessary sys.exit calls.
* Add files filtering for code-smell tests.
* Enhance test-constraints code-smell test.
* Simplify compile sanity test.
* Pass paths to importer on stdin.
* Pass paths to yamllinter on stdin.
* Add work-around for unicode path filtering.
* Enhance configure-remoting-ps1 code-smell test.
* Enhance integration-aliases code-smell test.
* Enhance azure-requirements code-smell test.
* Enhance no-illegal-filenames code-smell test.

test/sanity/code-smell/empty-init.py

@@ -19,9 +19,6 @@ def main():
         if path in skip:
             continue
 
-        if os.path.basename(path) != '__init__.py':
-            continue
-
         if os.path.getsize(path) > 0:
             print('%s: empty __init__.py required' % path)