Fix tests by setting expected watch_namespace

Signed-off-by: Charlie Le <[email protected]>

Author: CharlieTLe

tests/e2e-targetallocator-cr/01-assert.yaml

@@ -87,6 +87,7 @@ data:
       scrape_config_selector: null
       scrape_interval: 30s
       service_monitor_selector: null
+      watch_namespace: ""
 kind: ConfigMap
 metadata:
   name: cr-targetallocator
@@ -136,4 +137,4 @@ spec:
       app.kubernetes.io/managed-by: opentelemetry-operator
       app.kubernetes.io/name: cr-targetallocator
       app.kubernetes.io/part-of: opentelemetry
-  maxUnavailable: 1
+  maxUnavailable: 1