Fix a bug when forking a repository in an organization (#36950)

`CanCreateOrgRepo` should be checked before forking a repository into this organization.

---------

Signed-off-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/api/v1/repo/repo.go

@@ -498,31 +498,11 @@ func CreateOrgRepo(ctx *context.APIContext) {
 	//   "403":
 	//     "$ref": "#/responses/forbidden"
 	opt := web.GetForm(ctx).(*api.CreateRepoOption)
-	org, err := organization.GetOrgByName(ctx, ctx.PathParam("org"))
-	if err != nil {
-		if organization.IsErrOrgNotExist(err) {
-			ctx.APIError(http.StatusUnprocessableEntity, err)
-		} else {
-			ctx.APIErrorInternal(err)
-		}
+	orgName := ctx.PathParam("org")
+	org := prepareDoerCreateRepoInOrg(ctx, orgName)
+	if ctx.Written() {
 		return
 	}
-
-	if !organization.HasOrgOrUserVisible(ctx, org.AsUser(), ctx.Doer) {
-		ctx.APIErrorNotFound("HasOrgOrUserVisible", nil)
-		return
-	}
-
-	if !ctx.Doer.IsAdmin {
-		canCreate, err := org.CanCreateOrgRepo(ctx, ctx.Doer.ID)
-		if err != nil {
-			ctx.APIErrorInternal(err)
-			return
-		} else if !canCreate {
-			ctx.APIError(http.StatusForbidden, "Given user is not allowed to create repository in organization.")
-			return
-		}
-	}
 	CreateUserRepo(ctx, org.AsUser(), *opt)
 }