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_notify.go

@@ -1,6 +1,7 @@
 package shell
 
 import (
+	"context"
 	"fmt"
 	"io"
 
@@ -51,7 +52,7 @@ func (c *commandFsMetaNotify) Do(args []string, commandEnv *CommandEnv, writer i
 
 	var dirCount, fileCount uint64
 
-	err = filer_pb.TraverseBfs(commandEnv, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) {
+	err = filer_pb.TraverseBfs(context.Background(), commandEnv, util.FullPath(path), func(parentPath util.FullPath, entry *filer_pb.Entry) error {
 
 		if entry.IsDirectory {
 			dirCount++
@@ -69,7 +70,7 @@ func (c *commandFsMetaNotify) Do(args []string, commandEnv *CommandEnv, writer i
 		if notifyErr != nil {
 			fmt.Fprintf(writer, "fail to notify new entry event for %s: %v\n", parentPath.Child(entry.Name), notifyErr)
 		}
-
+		return nil
 	})
 
 	if err == nil {