Error messages could be improved

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.