Fix remaining CodeQL findings: add path classifiers and fix cert validity (#1619)

- Add path_classifiers (generated, test) to CodeQL.yml for belt-and-suspenders exclusion of third-party php-sdk and test code
- Fix mock_tds_server.py openssl cert validity from 365 to 30 days to resolve leap year CodeQL alert

Author: jahnvi480

CodeQL.yml

@@ -1,3 +1,9 @@
+path_classifiers:
+  generated:
+    - "buildscripts/php-sdk"
+  test:
+    - "test"
+
 queries:
   # Exclude all external PHP SDK source code
   - exclude:

test/tools/mock_tds_server.py

@@ -1304,7 +1304,7 @@ def generate_self_signed_cert(cert_path, key_path):
                 "openssl", "req", "-x509", "-newkey", "rsa:2048",
                 "-keyout", key_path,
                 "-out", cert_path,
-                "-days", "365",
+                "-days", "30",
                 "-nodes",
                 "-subj", "/CN=localhost",
             ],