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](https://github.com/go-gitea/gitea/assets/47871822/b9b43fb4-824b-47f9-b8e2-12004313647c)

---------

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

services/convert/repository.go

@@ -113,8 +113,11 @@ func innerToRepo(ctx context.Context, repo *repo_model.Repository, permissionInR
 		defaultAllowMaintainerEdit = config.DefaultAllowMaintainerEdit
 	}
 	hasProjects := false
-	if _, err := repo.GetUnit(ctx, unit_model.TypeProjects); err == nil {
+	projectsMode := repo_model.ProjectsModeAll
+	if unit, err := repo.GetUnit(ctx, unit_model.TypeProjects); err == nil {
 		hasProjects = true
+		config := unit.ProjectsConfig()
+		projectsMode = config.ProjectsMode
 	}
 
 	hasReleases := false
@@ -211,6 +214,7 @@ func innerToRepo(ctx context.Context, repo *repo_model.Repository, permissionInR
 		InternalTracker:               internalTracker,
 		HasWiki:                       hasWiki,
 		HasProjects:                   hasProjects,
+		ProjectsMode:                  string(projectsMode),
 		HasReleases:                   hasReleases,
 		HasPackages:                   hasPackages,
 		HasActions:                    hasActions,