chore: Unify lifecycle ingore path syntax in test so same utility function can be used (#3145)

Author: AgustinBettati

internal/service/advancedcluster/resource_advanced_cluster_test.go

@@ -2066,8 +2066,8 @@ func configReplicationSpecsAutoScaling(t *testing.T, isAcc bool, projectID, clus
 		lifecycleIgnoreChanges = `
 		lifecycle {
 			ignore_changes = [
-				replication_specs[0].region_configs[0].electable_specs[0].instance_size,
-				replication_specs[0].region_configs[0].electable_specs[0].disk_size_gb
+				replication_specs.0.region_configs.0.electable_specs.0.instance_size,
+				replication_specs.0.region_configs.0.electable_specs.0.disk_size_gb
 			]
         }`
 	}

internal/testutil/acc/advanced_cluster_preview_provider_v2.go

@@ -93,13 +93,6 @@ func AttrNameToPreviewProviderV2(isAcc bool, name string) string {
 	return name
 }
 
-func attrReferenceToPreviewProviderV2(name string) string {
-	for _, singleAttrName := range tpfSingleNestedAttrs {
-		name = strings.ReplaceAll(name, singleAttrName+"[0]", singleAttrName)
-	}
-	return name
-}
-
 func ConvertAdvancedClusterToPreviewProviderV2(t *testing.T, isAcc bool, def string) string {
 	t.Helper()
 	if skipPreviewProviderV2Work(isAcc) {
@@ -122,7 +115,7 @@ func ConvertAdvancedClusterToPreviewProviderV2(t *testing.T, isAcc bool, def str
 		convertKeyValueAttrs(t, "tags", writeBody)
 	}
 	result := string(parse.Bytes())
-	result = attrReferenceToPreviewProviderV2(result) // useful for lifecycle ingore definitions
+	result = AttrNameToPreviewProviderV2(isAcc, result) // useful for lifecycle ingore definitions
 	return result
 }