fix: eliminate all 420 compiler warnings

- Add allow(async_fn_in_trait) in lib.rs for async trait methods
- Add integration_tests feature to Cargo.toml for cfg gating
- Gate trash_service_test module with cfg(feature = integration_tests)
- Remove unused MockFileWritePort from idor_protection_test.rs

Cargo.toml

@@ -57,6 +57,7 @@ socket2 = { version = "0.6.2", features = ["all"] }
 [features]
 default = []
 test_utils = ["mockall"]
+integration_tests = []
 
 [profile.release]
 lto = "fat"