internal/utils: Add unit tests

Add unit tests for various utils functions.

Signed-off-by: Sunny <darkowlzz@protonmail.com>

internal/utils/testdata/components-without-crds.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: flux-system
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: kustomize-controller
+  namespace: flux-system
+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: notification-controller
+  namespace: flux-system