fix(sec): permission check for project issue

- Do an access check when loading issues for a project board, currently
this is not done and exposes the title, labels and existence of a
private issue that the viewer of the project board may not have access
to.
- The number of issues cannot be calculated in a efficient manner
and stored in the database because their number may vary depending on
the visibility of the repositories participating in the project. The
previous implementation used the pre-calculated numbers stored in each
project, which did not reflect that potential variation.
- The code is derived from https://github.com/go-gitea/gitea/pull/22865

(cherry picked from commit 2193afaeb9954a5778f5a47aafd0e6fbbf48d000)

routers/web/repo/projects.go

@@ -125,6 +125,19 @@ func Projects(ctx *context.Context) {
 	ctx.Data["IsProjectsPage"] = true
 	ctx.Data["SortType"] = sortType
 
+	numOpenIssues, err := issues_model.NumIssuesInProjects(ctx, projects, ctx.Doer, ctx.Org.Organization, optional.Some(false))
+	if err != nil {
+		ctx.ServerError("NumIssuesInProjects", err)
+		return
+	}
+	numClosedIssues, err := issues_model.NumIssuesInProjects(ctx, projects, ctx.Doer, ctx.Org.Organization, optional.Some(true))
+	if err != nil {
+		ctx.ServerError("NumIssuesInProjects", err)
+		return
+	}
+	ctx.Data["NumOpenIssuesInProject"] = numOpenIssues
+	ctx.Data["NumClosedIssuesInProject"] = numClosedIssues
+
 	ctx.HTML(http.StatusOK, tplProjects)
 }
 
@@ -310,7 +323,7 @@ func ViewProject(ctx *context.Context) {
 		return
 	}
 
-	issuesMap, err := issues_model.LoadIssuesFromBoardList(ctx, boards)
+	issuesMap, err := issues_model.LoadIssuesFromBoardList(ctx, boards, ctx.Doer, nil, optional.None[bool]())
 	if err != nil {
 		ctx.ServerError("LoadIssuesOfBoards", err)
 		return