Fix build configuration and DuckDB secrets and extension loading

[nasmart]

• Update build.gradle to exclude all META-INF signature files (*.DSA, *.RSA, *.SF) when building the fat JAR to prevent runtime SecurityExceptions.
• Install and load DuckDB httpfs extension before creating GCS secrets, which is required for DuckDB to interact with Google Cloud Storage.
• Escape single quotes in DuckDB secret strings (passwords) to prevent SQL syntax errors or potential SQL injection when running CREATE SECRET.

---

PR created automatically by Jules for task 12647129327290828707 started by @nasmart

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.