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_update-update.sql

@@ -3,6 +3,8 @@ UPDATE
 SET
   `encrypted_data` = '[115 101 99 114 101 116]',
   `updated` = 5679
-WHERE `namespace` = 'ns' AND
-  `uid` = 'abc123'
+WHERE 
+  `namespace` = 'ns' AND
+  `name` = 'n1' AND
+  `version` = 1
 ;