Secrets: encryption encryption storage uses versioning (#108036)

* Secrets: delete unused FakeKeeper

* Secrets: encrypted value storage stores versions

* add version to span

* trigger build

* remove ineffectual assignment

* lint

* drop secret_encrypted_value.uid / add name and version columns

pkg/storage/secret/encryption/testdata/mysql--encrypted_value_create-create.sql

@@ -1,12 +1,14 @@
 INSERT INTO `secret_encrypted_value` (
-  `uid`,
   `namespace`,
+  `name`,
+  `version`,
   `encrypted_data`,
   `created`,
   `updated`
 ) VALUES (
-  'abc123',
   'ns',
+  'n1',
+  1,
   '[115 101 99 114 101 116]',
   1234,
   5678