fix(tests): improve concurrency handling in worker tests and enhance module cloning

- Added environment variable `EVOBGP_JOB_MAX_CONCURRENT` to control job concurrency in tests.
- Modified worker test to ensure proper synchronization of job processing by holding workers until both jobs are enqueued.
- Updated memory store methods to return cloned module instances, preventing unintended mutations of original modules during operations.

internal/jobs/worker_test.go

@@ -10,6 +10,7 @@ import (
 func TestParallelModuleRefresh_CoalescesDeployApply(t *testing.T) {
 	t.Setenv("EVOBGP_ASN_RESOLVE", "0")
 	t.Setenv("EVOBGP_BIRD_ACTIVE_DIR", "") // skip bird binary path in deploy_apply
+	t.Setenv("EVOBGP_JOB_MAX_CONCURRENT", "8")
 
 	m := store.NewMemory()
 	m.SeedDemo()
@@ -35,8 +36,15 @@ func TestParallelModuleRefresh_CoalescesDeployApply(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// Hold workers until both jobs are enqueued so inflightRefresh=2 before either
+	// finishModuleRefreshSuccess. Otherwise a fast ingest can finalize+deploy before
+	// the second Enqueue — sequential refreshes correctly produce two deploy_apply jobs.
+	start := make(chan struct{})
 	wk := &Worker{Store: m}
-	reg := NewRegistry(wk.Process)
+	reg := NewRegistry(func(j *Job) {
+		<-start
+		wk.Process(j)
+	})
 	wk.Registry = reg
 
 	mid1 := modIP
@@ -47,6 +55,7 @@ func TestParallelModuleRefresh_CoalescesDeployApply(t *testing.T) {
 	if _, _, err := reg.Enqueue(tenant, KindModuleRefresh, nil, &mid2, map[string]any{"module_id": mod2.ID}); err != nil {
 		t.Fatal(err)
 	}
+	close(start)
 
 	waitSucceededJobsByKindCount(t, reg, tenant, KindModuleRefresh, 2)