Log conductorScanId in object processor tasks

This commit extracts conductorScanId from the ActionQueueEntry context in
LifecycleDeleteObjectTask, LifecycleUpdateTransitionTask, and
LifecycleUpdateExpirationTask processActionEntry() methods.
Attaches it to the logger default fields so every log line
produced while processing an object action (delete, transition
metadata update, restore expiration) carries the scan identifier.
This completes the end-to-end propagation: the same scanId
appears in conductor, bucket processor, lifecycle task, and
object processor logs.

Issue: BB-740

Author: benzekrimaha

extensions/lifecycle/tasks/LifecycleDeleteObjectTask.js

@@ -304,6 +304,11 @@ class LifecycleDeleteObjectTask extends BackbeatTask {
     processActionEntry(entry, done) {
         const startTime = Date.now();
         const log = this.logger.newRequestLogger();
+        const conductorScanId = entry.getContextAttribute(
+            'conductorScanId');
+        if (conductorScanId && typeof log.addDefaultFields === 'function') {
+            log.addDefaultFields({ conductorScanId });
+        }
         entry.addLoggedAttributes({
             bucketName: 'target.bucket',
             objectKey: 'target.key',

extensions/lifecycle/tasks/LifecycleUpdateExpirationTask.js

@@ -150,6 +150,11 @@ class LifecycleUpdateExpirationTask extends BackbeatTask {
     processActionEntry(entry, done) {
         const startTime = Date.now();
         const log = this.logger.newRequestLogger();
+        const conductorScanId = entry.getContextAttribute(
+            'conductorScanId');
+        if (conductorScanId && typeof log.addDefaultFields === 'function') {
+            log.addDefaultFields({ conductorScanId });
+        }
         entry.addLoggedAttributes({
             bucketName: 'target.bucket',
             objectKey: 'target.key',

extensions/lifecycle/tasks/LifecycleUpdateTransitionTask.js

@@ -260,6 +260,11 @@ class LifecycleUpdateTransitionTask extends BackbeatTask {
      */
     processActionEntry(entry, done) {
         const log = this.logger.newRequestLogger();
+        const conductorScanId = entry.getContextAttribute(
+            'conductorScanId');
+        if (conductorScanId && typeof log.addDefaultFields === 'function') {
+            log.addDefaultFields({ conductorScanId });
+        }
         entry.addLoggedAttributes({
             bucketName: 'target.bucket',
             objectKey: 'target.key',