Update MySQL secret type from mysql_connection_string to mysql_connection_url

Co-authored-by: felickz <1760475+felickz@users.noreply.github.com>

Author: Copilot

githubapi.py

@@ -32,7 +32,7 @@
         "http_basic_authentication_header",
         "http_bearer_authentication_header",
         "mongodb_connection_string",
-        "mysql_connection_string",
+        "mysql_connection_url",
         "openssh_private_key",
         "pgp_private_key",
         "postgres_connection_string",