Enable/disable owner and repo projects independently (#28805)

Part of #23318 

Add menu in repo settings to allow for repo admin to decide not just if
projects are enabled or disabled per repo, but also which kind of
projects (repo-level/owner-level) are enabled. If repo projects
disabled, don't show the projects tab.


![grafik](b9b43fb4-824b-47f9-b8e2-12004313647c)

---------

Co-authored-by: delvh <dev.lh@web.de>

modules/repository/create.go

@@ -93,6 +93,12 @@ func CreateRepositoryByExample(ctx context.Context, doer, u *user_model.User, re
 					AllowRebaseUpdate: true,
 				},
 			})
+		} else if tp == unit.TypeProjects {
+			units = append(units, repo_model.RepoUnit{
+				RepoID: repo.ID,
+				Type:   tp,
+				Config: &repo_model.ProjectsConfig{ProjectsMode: repo_model.ProjectsModeAll},
+			})
 		} else {
 			units = append(units, repo_model.RepoUnit{
 				RepoID: repo.ID,