Use request.CTX instead of *request.Context (#24877)

* Use request.CTX instead of *request.Context

* Fix tests

server/channels/app/slashcommands/command_offline.go

@@ -34,7 +34,7 @@ func (*OfflineProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Comm
 	}
 }
 
-func (*OfflineProvider) DoCommand(a *app.App, c *request.Context, args *model.CommandArgs, message string) *model.CommandResponse {
+func (*OfflineProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
 	a.SetStatusOffline(args.UserId, true)
 
 	return &model.CommandResponse{ResponseType: model.CommandResponseTypeEphemeral, Text: args.T("api.command_offline.success")}