Enhance logging messages

[javidahmed64592]

This pull request updates logging messages and refines some code logic in python_template_server/template_server.py to improve clarity and consistency. The main focus is on making log statements more explicit about the enabled or disabled status of features, and minor code cleanups for readability.

Logging improvements:

• Updated log messages throughout the server setup to use a consistent "ENABLED"/"DISABLED" format for features like request logging, security headers, CORS, and rate limiting. This makes it clearer in logs whether a feature is active or not. [1] [2] [3] [4] [5]
• Added a log statement when loading configuration files to provide better traceability.
• Minor tweaks to log message wording for consistency and clarity (e.g., punctuation and phrasing). [1] [2]

Code cleanups:

• Simplified the 404.html handler by using the walrus operator for more concise code.
• Refactored router setup to use a local variable for clarity.
• Updated static files mounting to avoid unnecessary string conversion.

Testing:

• Removed an unnecessary patch for static_dir_exists in the test fixture, likely because the logic has become simpler or more robust.