fix(kubectl): support completion for snap installs (#10727)

plugins/kubectl/kubectl.plugin.zsh

@@ -11,11 +11,11 @@ if (( $+commands[kubectl] )); then
   # If the completion file does not exist, generate it and then source it
   # Otherwise, source it and regenerate in the background
   if [[ ! -f "$ZSH_CACHE_DIR/completions/_kubectl" ]]; then
-    kubectl completion zsh >| "$ZSH_CACHE_DIR/completions/_kubectl"
+    kubectl completion zsh | tee "$ZSH_CACHE_DIR/completions/_kubectl" >/dev/null
     source "$ZSH_CACHE_DIR/completions/_kubectl"
   else
     source "$ZSH_CACHE_DIR/completions/_kubectl"
-    kubectl completion zsh >| "$ZSH_CACHE_DIR/completions/_kubectl" &|
+    kubectl completion zsh | tee "$ZSH_CACHE_DIR/completions/_kubectl" >/dev/null &|
   fi
 fi