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/store/memory_crud.go

@@ -38,7 +38,7 @@ func (m *Memory) CreateModule(tenantID string, in *Module) (*Module, error) {
 	}
 	NormalizeModuleDoh(mod)
 	m.modules[id] = mod
-	return mod, nil
+	return cloneModule(mod), nil
 }
 
 func (m *Memory) UpdateModule(tenantID, moduleID string, patch *ModulePatch) (*Module, error) {
@@ -74,12 +74,14 @@ func (m *Memory) UpdateModule(tenantID, moduleID string, patch *ModulePatch) (*M
 			mod.DefaultCommunityID = &v
 		}
 	}
-	ApplyModuleDohPatch(mod, patch)
+	if patch.DohProfileIDs != nil || patch.DohProfileID != nil || patch.DohResolverPolicy != nil {
+		ApplyModuleDohPatch(mod, patch)
+	}
 	if patch.LastRefreshedAt != nil {
 		t := patch.LastRefreshedAt.UTC()
 		mod.LastRefreshedAt = &t
 	}
-	return mod, nil
+	return cloneModule(mod), nil
 }
 
 func (m *Memory) SoftDeleteModule(tenantID, moduleID string) error {