fix(kubectx): fix display of k8s contexts without double quotes (#12534)

BREAKING CHANGE: the `kubectx` plugin now properly displays contexts from the
kubectx_mapping array, without using double quotes. Please refer to the plugin
README to see how to use it properly.

Closes #12534

Co-authored-by: Ken Kelly <ken@kenhkelly.us>

plugins/kubectx/kubectx.plugin.zsh

@@ -7,7 +7,9 @@ function kubectx_prompt_info() {
 
   [[ -n "$current_ctx" ]] || return
 
-  # use value in associative array if it exists
-  # otherwise fall back to the context name
-  echo "${kubectx_mapping[\"$current_ctx\"]:-${current_ctx:gs/%/%%}}"
+  # Use value in associative array if it exists, otherwise fall back to the context name
+  #
+  # Note: we need to escape the % character in the prompt string when coming directly from
+  # the context name, as it could contain a % character.
+  echo "${kubectx_mapping[$current_ctx]:-${current_ctx:gs/%/%%}}"
 }