fix: ref should have pullreq instead of pull for gitness (#278)

Author: abhinav-harness

scm/driver/harness/pr.go

@@ -182,7 +182,7 @@ func convertPullRequest(src *pr) *scm.PullRequest {
 			Email: src.Author.Email,
 		},
 		Fork:   "fork",
-		Ref:    fmt.Sprintf("refs/pull/%d/head", src.Number),
+		Ref:    fmt.Sprintf("refs/pullreq/%d/head", src.Number),
 		Closed: src.State == "closed",
 	}
 }

scm/driver/harness/testdata/pr.json.golden

@@ -3,7 +3,7 @@
 	"Title": "pull title",
 	"Body": "pull description",
 	"Sha": "",
-	"Ref": "refs/pull/1/head",
+	"Ref": "refs/pullreq/1/head",
 	"Source": "bla",
 	"Target": "main",
 	"Fork": "fork",