[PM-18972] - Fix query for Org By User Domain (#5474)

* Changed query to avoid table scan. Added index to speed up query as well.

util/Migrator/DbScripts/2025-03-06_00_ReadByClaimedUserEmailDomain_AndIndex.sql

@@ -0,0 +1,31 @@
+CREATE OR ALTER PROCEDURE [dbo].[Organization_ReadByClaimedUserEmailDomain]
+    @UserId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON;
+
+    WITH CTE_User AS (
+        SELECT
+            U.*,
+            SUBSTRING(U.Email, CHARINDEX('@', U.Email) + 1, LEN(U.Email)) AS EmailDomain
+        FROM dbo.[UserView] U
+        WHERE U.[Id] = @UserId
+    )
+    SELECT O.*
+    FROM CTE_User CU
+             INNER JOIN dbo.[OrganizationUserView] OU ON CU.[Id] = OU.[UserId]
+             INNER JOIN dbo.[OrganizationView] O ON OU.[OrganizationId] = O.[Id]
+             INNER JOIN dbo.[OrganizationDomainView] OD ON OU.[OrganizationId] = OD.[OrganizationId]
+    WHERE OD.[VerifiedDate] IS NOT NULL
+      AND CU.EmailDomain = OD.[DomainName]
+      AND O.[Enabled] = 1
+END
+GO
+
+IF NOT EXISTS(SELECT name FROM sys.indexes WHERE name = 'IX_OrganizationDomain_DomainNameVerifiedDateOrganizationId')
+    BEGIN
+        CREATE NONCLUSTERED INDEX [IX_OrganizationDomain_DomainNameVerifiedDateOrganizationId]
+            ON [dbo].[OrganizationDomain] ([DomainName],[VerifiedDate])
+            INCLUDE ([OrganizationId])
+    END
+GO