fix(gatsby): resolve url file paths before reading

[TylerBarnes]

With esm source plugins, the stack trace util can't find the right path to read:

Sample trace of the problem where the real error is obscured

Error: ENOENT: no such file or directory, open 'file:///usr/src/app/www/node_modules/example-source-plugin/index.js'
    at Object.openSync (node:fs:600:3)
    at Object.readFileSync (node:fs:468:35)
    at getNonGatsbyCodeFrame (/usr/src/app/www/node_modules/gatsby/src/utils/stack-trace-utils.ts:74:19)
    at createNode (/usr/src/app/www/node_modules/gatsby/src/redux/actions/public.js:736:33)
    at /usr/src/app/www/node_modules/gatsby/src/redux/actions/public.js:835:21
    at /usr/src/app/www/node_modules/redux-thunk/lib/index.js:23:18
    at boundActionCreator (/usr/src/app/www/node_modules/redux/lib/redux.js:586:12)
    at Object.doubleBoundActionCreators.<computed> [as createNode] (/usr/src/app/www/node_modules/gatsby/src/utils/api-runner-node.js:108:20)
    at nodesApi.createNode (file:///usr/src/app/www/node_modules/example-source-plugin/index.js:573:49)
    at insertNode (file:///usr/src/app/www/node_modules/example-source-plugin/model/definition.js:423:28)
    at file:///usr/src/app/www/node_modules/example-source-plugin/model/definition.js:427:44
    at Array.map (<anonymous>)
    at Object.create (file:///usr/src/app/www/node_modules/example-source-plugin/model/definition.js:427:30)
    at file:///usr/src/app/www/src/index.ts:55:21
    at runNextModelInSlot (file:///usr/src/app/www/node_modules/example-source-plugin/model/builder.js:195:40)
    at Array.map (<anonymous>) {
  errno: -2,
  syscall: 'open',
  code: 'ENOENT',
  path: 'file:///usr/src/app/www/node_modules/example-source-plugin/index.js'
}