Fix null requested_reviewer from API (#31773)

If the assign the pull request review to a team, it did not show the
members of the team in the "requested_reviewers" field, so the field was
null. As a solution, I added the team members to the array.

fix #31764

(cherry picked from commit 94cca8846e7d62c8a295d70c8199d706dfa60e5c)

templates/swagger/v1_json.tmpl

@@ -25088,6 +25088,13 @@
           },
           "x-go-name": "RequestedReviewers"
         },
+        "requested_reviewers_teams": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/Team"
+          },
+          "x-go-name": "RequestedReviewersTeams"
+        },
         "review_comments": {
           "description": "number of review comments made on the diff of a PR review (not including comments on commits or issues in a PR)",
           "type": "integer",