Fix review request number and add more tests (#27104)

fix #27019 
## testfixture yml
1. add issue20(a pr issue) in repo 23, org 17
2. add user15 to team 9
3. add four reviews about issue20
## test case
add two tests that are described with code comments
the code before pr #26784 failed the first test
<img width="479" alt="image"
src="https://github.com/go-gitea/gitea/assets/70063547/1d9b5787-11b4-4c4d-931f-6a9869547f35">
current code failed the second test(as mentioned in #27019)
<img width="484" alt="image"
src="https://github.com/go-gitea/gitea/assets/70063547/05608055-7587-43d1-bae1-92c688270819">
Any advice is appreciated.

---------

Co-authored-by: CaiCandong <50507092+CaiCandong@users.noreply.github.com>
Co-authored-by: Giteabot <teabot@gitea.io>

models/fixtures/review.yml

@@ -132,3 +132,41 @@
   content: "singular review from org6 and final review for this pr"
   updated_unix: 946684831
   created_unix: 946684831
+
+- 
+  id: 16
+  type: 4
+  reviewer_id: 20
+  issue_id: 20
+  content: "review request for user20"
+  updated_unix: 946684832
+  created_unix: 946684832
+
+- 
+  id: 17
+  type: 1
+  reviewer_id: 20
+  issue_id: 20
+  content: "review approved by user20"
+  updated_unix: 946684833
+  created_unix: 946684833
+- 
+  id: 18
+  type: 4
+  reviewer_id: 0
+  reviewer_team_id: 5 
+  issue_id: 20
+  content: "review request for team5"
+  updated_unix: 946684834
+  created_unix: 946684834
+
+-
+  id: 19
+  type: 4
+  reviewer_id: 15
+  reviewer_team_id: 0
+  issue_id: 20
+  content: "review request for user15"
+  updated_unix: 946684835
+  created_unix: 946684835
+