test: add template anchors merge e2e test

Signed-off-by: yxxhero <aiopsclub@163.com>

test/e2e/template/helmfile/testdata/snapshot/issue_493_template_yaml_anchors_merge/config.yaml

@@ -0,0 +1,4 @@
+chartifyTempDir: template_anchors_merge_temp
+helmfileArgs:
+- list
+- --skip-charts

test/e2e/template/helmfile/testdata/snapshot/issue_493_template_yaml_anchors_merge/input.yaml

@@ -0,0 +1,21 @@
+templates:
+  default_release: &default_release
+    namespace: "myNamespace"
+  default_labels:
+    labels: &default_labels
+      project: "myProject"
+      group: "myGroup"
+
+releases:
+  - name: "release1"
+    << : *default_release
+    labels:
+      <<: *default_labels
+      app: "myapp"
+    chart: "test"
+  - name: "release2"
+    << : *default_release
+    labels:
+      <<: *default_labels
+      app: "myapp"
+    chart: "test"

test/e2e/template/helmfile/testdata/snapshot/issue_493_template_yaml_anchors_merge/output.yaml

@@ -0,0 +1,3 @@
+NAME    	NAMESPACE  	ENABLED	INSTALLED	LABELS                                   	CHART	VERSION
+release1	myNamespace	true   	true     	app:myapp,group:myGroup,project:myProject	test 	       
+release2	myNamespace	true   	true     	app:myapp,group:myGroup,project:myProject	test