fix(backend api): re-enable previosuly disabled tests (#737)

See https://github.com/ooni/probe/issues/2098

internal/cmd/apitool/main_test.go

@@ -11,7 +11,6 @@ func init() {
 }
 
 func TestCheck(t *testing.T) {
-	t.Skip("see https://github.com/ooni/probe/issues/2098")
 	*mode = "check"
 	main()
 }

internal/engine/probeservices/checkreportid_test.go

@@ -14,7 +14,6 @@ import (
 )
 
 func TestCheckReportIDWorkingAsIntended(t *testing.T) {
-	t.Skip("see https://github.com/ooni/probe/issues/2098")
 	client := probeservices.Client{
 		APIClientTemplate: httpx.APIClientTemplate{
 			BaseURL:    "https://ams-pg.ooni.org/",

internal/ooapi/integration_test.go

@@ -46,7 +46,6 @@ func TestWithRealServerDoCheckIn(t *testing.T) {
 }
 
 func TestWithRealServerDoCheckReportID(t *testing.T) {
-	t.Skip("see https://github.com/ooni/probe/issues/2098")
 	if testing.Short() {
 		t.Skip("skip test in short mode")
 	}