fix: increase performance of ListUser by login name ignore case (#12350)

# Which Problems Are Solved

Login v2 uses the `users.v2.ListUsers`-endpoint to get a user by login
name. This query had an inefficient `WHERE`-clause.

# How the Problems Are Solved

Update the view and use a specific clause for this query.

# Additional information

Added in https://github.com/zitadel/zitadel/pull/10475

---------

Co-authored-by: Marco A. <[email protected]>
Co-authored-by: Livio Spring <[email protected]>

internal/query/projection/login_name_query.sql

@@ -6,6 +6,11 @@ SELECT
     END AS login_name
     , COALESCE(d.is_primary, TRUE) AS is_primary
     , u.instance_id
+    , u.resource_owner
+    , CASE
+            WHEN p.must_be_domain THEN CONCAT(u.user_name_lower, '@', d.name_lower)
+            ELSE u.user_name_lower
+    END AS login_name_lower
 FROM
     projections.login_names3_users AS u
 LEFT JOIN LATERAL (