fix: use unique workspace owners over unique users (#11044)

coderd/database/queries/workspaces.sql

@@ -287,6 +287,15 @@ WHERE
 	AND LOWER("name") = LOWER(@name)
 ORDER BY created_at DESC;
 
+-- name: GetWorkspaceUniqueOwnerCountByTemplateIDs :many
+SELECT
+	template_id, COUNT(DISTINCT owner_id) AS unique_owners_sum
+FROM
+	workspaces
+WHERE
+	template_id = ANY(@template_ids :: uuid[]) AND deleted = false
+GROUP BY template_id;
+
 -- name: InsertWorkspace :one
 INSERT INTO
 	workspaces (