diff-npm-package: create reports folder

[yaacovCR]

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[yaacovCR]

this is still actually (sadly) not working, although CI now is.

https://github.com/graphql/graphql-js/pull/3623/checks#step:7:7

Run actions/upload-artifact@v3
with:
name: npm-dist-diff.html
path: ./reports/npm-dist-diff.html
if-no-files-found: ignore
No files were found with the provided path: ./reports/npm-dist-diff.html. No artifacts will be uploaded.

will try to submit a fix

[yaacovCR]

never mind, sorry for the error, script doesn't generate a report if no diff is found.

on the other hand, the code change is a bit odd, as we are testing to see whether the file is present, and then if not, creating the directory with the path to the file. i guess it is working, but still a bit off.