feat: add unified storage data migration step for playlists (#114582)

* fix: add type

* feat: register step

* feat: add playlist support

* test: add test case

* fix: gen mock

* fix: go gen

* fix: lint

* fix: lint

* fix: tests

* fix: add resource

* fix: readd

* fix: address comments

* fix: independent playlist query for migrations

* fix: remove lock logic for sqlite

* fix: handle creation and update datetimes

* fix: query templating

* fix: simply resources and address comments

pkg/registry/apis/dashboard/legacy/query_playlists.sql

@@ -0,0 +1,18 @@
+SELECT
+    p.id,
+    p.org_id,
+    p.uid,
+    p.name,
+    p.interval,
+    p.created_at,
+    p.updated_at,
+    pi.type as item_type,
+    pi.value as item_value
+FROM
+    {{ .Ident .PlaylistTable }} as p
+    LEFT OUTER JOIN {{ .Ident .PlaylistItemTable }} as pi ON p.id = pi.playlist_id
+WHERE
+    p.org_id = {{ .Arg .Query.OrgID }}
+ORDER BY
+    p.id ASC,
+    pi.{{ .Ident "order" }} ASC