Merge Request Summary doesn't work on forked MR

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Summary

When clicking Summarize changes while editing the description of Draft: Merge distroless UBI to canonical (gitlab-org/security-products/analyzers/gemnasium!804 - closed), the button shows a loading behaviour, then returns to normal, but nothing happens. The MR happens to be a fork.

Steps to reproduce

1. Go to Draft: Merge distroless UBI to canonical (gitlab-org/security-products/analyzers/gemnasium!804 - closed)
2. Click Edit
3. Click Summarize code changes (with your cursor somewhere in the editor)
4. See nothing happens

Example Project

Draft: Merge distroless UBI to canonical (gitlab-org/security-products/analyzers/gemnasium!804 - closed)

What is the current bug behavior?

Clicking Summarize code changes does nothing.

What is the expected correct behavior?

Clicking Summarize code changes creates a summary of the changes.

Relevant logs and/or screenshots

Bug_

Output of checks

This bug happens on GitLab.com

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes