cleanup: remove #[serial] annotations from e2e_test, scanner, lifecycle, and object-capacity crates

Remove no-op #[serial] attributes (nextest ignores serial_test) and the
serial_test dependency from four crates. All tests already use temp_env
for env-var isolation, making #[serial] purely redundant.

Crates cleaned:
- e2e_test (37 annotations, 9 imports, removed serial_test dep)
- rustfs-scanner (115 annotations across 7 files, removed serial_test dep)
- rustfs-lifecycle (46 annotations, removed serial_test dep)
- rustfs-object-capacity (38 annotations, removed serial_test dep)

Also converted scanner/tests/lifecycle_integration_test.rs
with_forced_immediate_enqueue_timeout helper from unsafe raw
env::set_var/remove_var to temp_env::async_with_vars for proper
isolation, and added async_closure feature to scanner's temp-env dep.

crates/e2e_test/src/policy/test_runner.rs

@@ -14,7 +14,6 @@
 
 use crate::common::init_logging;
 use crate::policy::test_env::PolicyTestEnvironment;
-use serial_test::serial;
 use std::time::Instant;
 use tokio::time::{Duration, sleep};
 use tracing::{error, info};
@@ -213,7 +212,6 @@ impl PolicyTestSuite {
 
 /// Test suite
 #[tokio::test]
-#[serial]
 #[ignore = "Connects to existing rustfs server"]
 async fn test_policy_critical_suite() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
     let config = TestSuiteConfig {