Error messages could be improved

[rbalicki2]

Consider this error message

[ERROR] Error: ✖︎ Operation 'ShoppingRootPageQuery' references undefined variable: '$isCloseupRelatedModulesQuery'.

  app/www/closeup/duplo/unauth/UnauthContextMenu.tsx:131:28
  130 │     }
  131 │     richMetadata @skip(if: $isCloseupRelatedModulesQuery) {
      │                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  132 │       article {

The diagnostic should have a related location that shows the definition location of ShoppingRootPageQuery, so that I can cmd+click to open it, instead of manually opening ShoppingRootPage. We also don't use haste 😭 (I know I know, it's our fault) so in some cases, there may be multiple possible definition locations.