**Backport:** https://codeberg.org/forgejo/forgejo/pulls/8450
The argument order for `ValidatePullRequest` is to first give the new commitID and then the old commit ID.
This results in reviews not being marked as stale when they are not stale and reviews as not stale when they are stale. The test will fail if the fix is not present.
Add testing for the following three scenarios:
1. A review is made, the PR is updated and as a consequence the PR's diff is changed. The review is now marked as stale.
2. A review is made but in the meantime the PR is updated and the review is submitted on a older commit ID. If the diff changed the review is marked as stale.
3. A review that was made against a older commit ID is no longer marked as stale if the PR is force-pushed to that older commit ID.
Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8454
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
Co-committed-by: forgejo-backport-action <forgejo-backport-action@noreply.codeberg.org>
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