LastImportTime for resource. (#112153)

* LastImportTime for resource.

* Make StorageBackendImpl implement GetResourceLastImportTimes

* More missing implementations of GetResourceLastImportTimes

* Fix import.

* Skip TestGetResourceLastImportTime in TestBadgerKVStorageBackend.

* Implement GetResourceLastImportTimes by mockStorageBackend

* Bump test tolerance.

* Fix postgres query and timezone.

* Fix postgres query and timezone.

* Make linter happy.

pkg/storage/unified/sql/data/resource_last_import_time_insert.sql

@@ -0,0 +1,42 @@
+{{ if eq $.DialectName "mysql" }}
+  INSERT INTO {{ .Ident "resource_last_import_time" }} (
+      {{ .Ident "group" }},
+      {{ .Ident "resource" }},
+      {{ .Ident "namespace" }},
+      {{ .Ident "last_import_time" }}
+    ) VALUES (
+      {{ .Arg .Group }},
+      {{ .Arg .Resource }},
+      {{ .Arg .Namespace }},
+      {{ .Arg .LastImportTime }}
+    ) ON DUPLICATE KEY UPDATE {{ .Ident "last_import_time" }} = {{ .Arg .LastImportTime }}
+
+{{ else if eq $.DialectName "sqlite" }}
+   INSERT OR REPLACE INTO {{ .Ident "resource_last_import_time" }} (
+       {{ .Ident "group" }},
+       {{ .Ident "resource" }},
+       {{ .Ident "namespace" }},
+       {{ .Ident "last_import_time" }}
+   ) VALUES (
+       {{ .Arg .Group }},
+       {{ .Arg .Resource }},
+       {{ .Arg .Namespace }},
+       {{ .Arg .LastImportTime }}
+   )
+
+{{ else if eq $.DialectName "postgres" }}
+    INSERT INTO {{ .Ident "resource_last_import_time" }} (
+       {{ .Ident "group" }},
+       {{ .Ident "resource" }},
+       {{ .Ident "namespace" }},
+       {{ .Ident "last_import_time" }}
+     ) VALUES (
+       {{ .Arg .Group }},
+       {{ .Arg .Resource }},
+       {{ .Arg .Namespace }},
+       {{ .Arg .LastImportTime }}
+    ) ON CONFLICT ({{ .Ident "group" }}, {{ .Ident "resource" }}, {{ .Ident "namespace" }})
+      DO UPDATE SET {{ .Ident "last_import_time" }} = {{ .Arg .LastImportTime }}
+
+{{ end }}
+;

pkg/storage/unified/sql/data/resource_last_import_time_query.sql

@@ -0,0 +1,8 @@
+SELECT
+  {{ .Ident "namespace" }},
+  {{ .Ident "group" }},
+  {{ .Ident "resource" }},
+  {{ .Ident "last_import_time" }}
+FROM
+  {{ .Ident "resource_last_import_time" }}
+;