Hitting "back" on browser bypasses checks

[Pilvinen]

Issue: PR -> click random link -> click "back" from browser -> no checks are run.

How to reproduce

1. Create a PR with CLA enforced.
2. Check out the PR, looks fine:
3. Click on any link to go to another page in the same tab you were just viewing the PR.
4. Click "back" on the browser to go back to the PR page you were just on.
5. You should now see this:
6. All ready to merge.

What should happen Checks should be run and merging should be prevented.