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/scanner/src/lib.rs

@@ -599,10 +599,8 @@ impl ScannerConfigObjectDelete for ECStore {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use serial_test::serial;
 
     #[tokio::test]
-    #[serial]
     async fn runtime_tier_names_serves_cached_arc_within_ttl() {
         reset_tier_name_cache_for_test();
         // The tier config manager is unconfigured in unit tests, so the
@@ -616,7 +614,6 @@ mod tests {
     }
 
     #[test]
-    #[serial]
     fn foreground_read_guard_tracks_stream_lifetime() {
         reset_foreground_read_activity_for_test();
         assert_eq!(current_foreground_read_activity(), 0);
@@ -630,7 +627,6 @@ mod tests {
     }
 
     #[test]
-    #[serial]
     fn foreground_read_activity_keeps_larger_signal() {
         reset_foreground_read_activity_for_test();
         let _guard = ForegroundReadGuard::new();
@@ -643,7 +639,6 @@ mod tests {
     }
 
     #[test]
-    #[serial]
     fn scanner_runtime_guard_tracks_runtime_lifetime() {
         reset_scanner_runtime_instances_for_test();
         assert!(!scanner_runtime_initialized());