Check that organization allows reviews from third-party tools as early as possible

I worked on a PR review, but upon pressing the "submit" button, nothing happens.

The console tells me:
```
https://api.github.com/repos//pulls//reviews 403 (Forbidden)
```
and
```
Uncaught (in promise) HttpError: Although you appear to have the correct authorization credentials, the
`` organization has enabled OAuth App access restrictions, meaning that data access to third-parties is
limited. For more information on these restrictions, including how to enable this app, visit
https://docs.github.com/articles/restricting-access-to-your-organization-s-data/
- https://docs.github.com/rest/pulls/reviews#create-a-review-for-a-pull-request
at fetchWrapper (chunk-mf7bhnzv.js:22378:11)
at async chunk-mf7bhnzv.js:22870:16
at async Object.createPRReview (chunk-mf7bhnzv.js:23407:29)
at async submitReview (chunk-mf7bhnzv.js:77451:21)
at async chunk-mf7bhnzv.js:91874:5
```

So it looks like until I can get those permissions from my org, I cannot use Pulldash for work, and I only learn this at the end of the review process, which means I'll have to rewrite the review.