x-accel: encode all paths to URIs

updates util function  encodeUriPath to use node:url with a file:// path
prefix, and updates all instances x-accel redirection to use this helper
util instead of sending unencoded paths into the header.

server/utils/fileUtils.js

@@ -293,5 +293,6 @@ module.exports.removeFile = (path) => {
 }
 
 module.exports.encodeUriPath = (path) => {
-  return filePathToPOSIX(path).replace(/%/g, '%25').replace(/#/g, '%23')
+  const uri = new URL(path, "file://")
+  return uri.pathname
 }