Fix volume.fsck -forcePurging -reallyDeleteFromVolume to fail fast on filer traversal errors (#8015)

* Add TraverseBfsWithContext and fix race conditions in error handling

- Add TraverseBfsWithContext function to support context cancellation
- Fix race condition in doTraverseBfsAndSaving using atomic.Bool and sync.Once
- Improve error handling with fail-fast behavior and proper error propagation
- Update command_volume_fsck to use error-returning saveFn callback
- Enhance error messages in readFilerFileIdFile with detailed context

* refactoring

* fix error format

* atomic

* filer_pb: make enqueue return void

* shell: simplify fs.meta.save error handling

* filer_pb: handle enqueue return value

* Revert "atomic"

This reverts commit 712648bc354b186d6654fdb8a46fd4848fdc4e00.

* shell: refine fs.meta.save logic

---------

Co-authored-by: Chris Lu <chris.lu@gmail.com>

weed/shell/command_fs_meta_change_volume_id.go

@@ -75,13 +75,13 @@ func (c *commandFsMetaChangeVolumeId) Do(args []string, commandEnv *CommandEnv,
 	}
 
 	return commandEnv.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
-		return filer_pb.TraverseBfs(commandEnv, util.FullPath(*dir), func(parentPath util.FullPath, entry *filer_pb.Entry) {
+		return filer_pb.TraverseBfs(context.Background(), commandEnv, util.FullPath(*dir), func(parentPath util.FullPath, entry *filer_pb.Entry) error {
 			if !entry.IsDirectory {
 				var hasChanges bool
 				for _, chunk := range entry.Chunks {
 					if chunk.IsChunkManifest {
 						fmt.Printf("Change volume id for large file is not implemented yet: %s/%s\n", parentPath, entry.Name)
-						return
+						return nil
 					}
 					chunkVolumeId := chunk.Fid.VolumeId
 					if toVolumeId, found := mapping[needle.VolumeId(chunkVolumeId)]; found {
@@ -102,6 +102,7 @@ func (c *commandFsMetaChangeVolumeId) Do(args []string, commandEnv *CommandEnv,
 					}
 				}
 			}
+			return nil
 		})
 	})
 }