Rename NotifyPullReviewRequest to NotifyPullRequestReviewRequest (#24988)
after #24481
To keep consistent, maybe pull_request_review_request is better.
## what my pull request does
Rename NotifyPullReviewRequest to NotifyPullRequestReviewRequest.
<img width="1087" alt="image"
src="https://github.com/go-gitea/gitea/assets/75628309/2cf91f02-74f2-42fe-a998-0a039b821d8d">