fix: flush stderr before printing hooks to ensure correct output order

When a command fails and error-hooks are enabled, the hooks were being
printed before the command's error message appeared in the output, creating
confusing output like:

  What's next:
    ...
  docker: open ./no-such-file: no such file or directory

This fix ensures stderr is flushed before printing hooks, so error
messages appear in the correct order:

  docker: open ./no-such-file: no such file or directory
  What's next:
    ...

Fixes: #6973
Signed-off-by: vigneshakaviki <kumarvignesh295@gmail.com>

Author: vigneshakaviki

cmd/docker/docker.go

@@ -546,6 +546,10 @@ func runDocker(ctx context.Context, dockerCli *command.DockerCli) error {
 	// If the command is being executed in an interactive terminal
 	// and hook are enabled, run the plugin hooks.
 	if subCommand != nil && dockerCli.Out().IsTerminal() && dockerCli.HooksEnabled() {
+		// Ensure stderr is flushed before printing hooks so error messages appear first
+		if errs, ok := dockerCli.Err().(*os.File); ok {
+			_ = errs.Sync()
+		}
 		pluginmanager.RunCLICommandHooks(ctx, dockerCli, cmd, subCommand, cmdErrorMessage(err))
 	}