Suppress dead_code and deprecated warnings in test utilities

Add #[allow(dead_code)] and #[allow(deprecated)] attributes to
suppress compiler warnings for utility functions and deprecated
Database methods used in test examples.

Changes:
- Add #[allow(dead_code)] to utils modules (cbs_admin, constants, sgw_admin)
- Add #[allow(deprecated)] to create_doc helper function
- Utility functions are used across different test examples, so dead_code
  warnings in one example are expected

This keeps test output clean and focused on actual test results.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: pimpin

examples/tombstone_quick_check.rs

@@ -79,6 +79,7 @@ fn main() {
     println!("=== Quick check complete ===");
 }
 
+#[allow(deprecated)]
 fn create_doc(db: &mut Database, id: &str, channel: &str) {
     let mut doc = Document::new_with_id(id);
     doc.set_properties_as_json(

examples/utils/mod.rs

@@ -1,5 +1,8 @@
+#[allow(dead_code)]
 pub mod cbs_admin;
+#[allow(dead_code)]
 pub mod constants;
+#[allow(dead_code)]
 pub mod sgw_admin;
 
 // Re-export commonly used functions