More db.DefaultContext refactor (#27265) (#27347)

Backport #27265 by @JakobDev

Part of #27065

This PR touches functions used in templates. As templates are not static
typed, errors are harder to find, but I hope I catch it all. I think
some tests from other persons do not hurt.

Co-authored-by: JakobDev <jakobdev@gmx.de>

routers/api/v1/repo/collaborators.go

@@ -53,7 +53,7 @@ func ListCollaborators(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	count, err := repo_model.CountCollaborators(ctx.Repo.Repository.ID)
+	count, err := repo_model.CountCollaborators(ctx, ctx.Repo.Repository.ID)
 	if err != nil {
 		ctx.InternalServerError(err)
 		return