[PM-23134] Update PolicyDetails sprocs for performance (#6421)

* Add integration tests for GetByUserIdWithPolicyDetailsAsync in OrganizationUserRepository

- Implemented multiple test cases to verify the behavior of GetByUserIdWithPolicyDetailsAsync for different user statuses (Confirmed, Accepted, Invited, Revoked).
- Ensured that the method returns correct policy details based on user status and organization.
- Added tests for scenarios with multiple organizations and non-existing policy types.
- Included checks for provider users and custom user permissions.

These tests enhance coverage and ensure the correctness of policy retrieval logic.

* Add UserProviderAccessView to identify which organizations a user can access as a provider

* Refactor PolicyDetails_ReadByUserId stored procedure to improve user access logic

- Introduced a Common Table Expression (CTE) for organization users to streamline the selection process based on user status and email.
- Added a CTE for providers to enhance clarity and maintainability.
- Updated the main query to utilize the new CTEs, improving readability and performance.
- Ensured that the procedure correctly identifies provider access based on user permissions.

* Refactor OrganizationUser_ReadByUserIdWithPolicyDetails stored procedure to enhance user access logic

- Introduced a Common Table Expression (CTE) for organization users to improve selection based on user status and email.
- Updated the main query to utilize the new CTEs, enhancing readability and performance.
- Adjusted the logic for identifying provider access to ensure accurate policy retrieval based on user permissions.

* Add new SQL migration script to refactor policy details queries

- Created a new view, UserProviderAccessView, to streamline user access to provider organizations.
- Introduced two stored procedures: PolicyDetails_ReadByUserId and OrganizationUser_ReadByUserIdWithPolicyDetails, enhancing the logic for retrieving policy details based on user ID and policy type.
- Utilized Common Table Expressions (CTEs) to improve query readability and performance, ensuring accurate policy retrieval based on user permissions and organization status.

* Remove GetPolicyDetailsByUserIdTests

* Refactor PolicyRequirementQuery to use GetPolicyDetailsByUserIdsAndPolicyType and update unit tests

* Remove GetPolicyDetailsByUserId method from IPolicyRepository and its implementations in PolicyRepository classes

* Revert changes to PolicyDetails_ReadByUserId stored procedure

* Refactor OrganizationUser_ReadByUserIdWithPolicyDetails stored procedure to use UNION instead of OR

* Reduce UserEmail variable size from NVARCHAR(320) to NVARCHAR(256) for consistency in stored procedures

* Bump date on migration script

util/Migrator/DbScripts/2025-10-15_00_RefactorPolicyDetailsQueries.sql

@@ -0,0 +1,85 @@
+CREATE OR ALTER VIEW [dbo].[UserProviderAccessView]
+AS
+SELECT DISTINCT
+    PU.[UserId],
+    PO.[OrganizationId]
+FROM
+    [dbo].[ProviderUserView] PU
+INNER JOIN
+    [dbo].[ProviderOrganizationView] PO ON PO.[ProviderId] = PU.[ProviderId]
+GO
+
+CREATE OR ALTER PROCEDURE [dbo].[OrganizationUser_ReadByUserIdWithPolicyDetails]
+    @UserId UNIQUEIDENTIFIER,
+    @PolicyType TINYINT
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    DECLARE @UserEmail NVARCHAR(256)
+    SELECT @UserEmail = Email
+    FROM
+        [dbo].[UserView]
+    WHERE
+        Id = @UserId
+
+    ;WITH OrgUsers AS
+    (
+        -- All users except invited (Status <> 0): direct UserId match
+        SELECT
+            OU.[Id],
+            OU.[OrganizationId],
+            OU.[Type],
+            OU.[Status],
+            OU.[Permissions]
+        FROM
+            [dbo].[OrganizationUserView] OU
+        WHERE
+            OU.[Status] <> 0
+            AND OU.[UserId] = @UserId
+
+        UNION ALL
+
+        -- Invited users: email match
+        SELECT
+            OU.[Id],
+            OU.[OrganizationId],
+            OU.[Type],
+            OU.[Status],
+            OU.[Permissions]
+        FROM
+            [dbo].[OrganizationUserView] OU
+        WHERE
+            OU.[Status] = 0
+            AND OU.[Email] = @UserEmail
+            AND @UserEmail IS NOT NULL
+    ),
+    Providers AS
+    (
+        SELECT
+            OrganizationId
+        FROM
+            [dbo].[UserProviderAccessView]
+        WHERE
+            UserId = @UserId
+    )
+    SELECT
+        OU.[Id] AS [OrganizationUserId],
+        P.[OrganizationId],
+        P.[Type] AS [PolicyType],
+        P.[Enabled] AS [PolicyEnabled],
+        P.[Data] AS [PolicyData],
+        OU.[Type] AS [OrganizationUserType],
+        OU.[Status] AS [OrganizationUserStatus],
+        OU.[Permissions] AS [OrganizationUserPermissionsData],
+        CASE WHEN PR.[OrganizationId] IS NULL THEN 0 ELSE 1 END AS [IsProvider]
+    FROM
+        [dbo].[PolicyView] P
+    INNER JOIN
+        OrgUsers OU ON P.[OrganizationId] = OU.[OrganizationId]
+    LEFT JOIN
+        Providers PR ON PR.[OrganizationId] = OU.[OrganizationId]
+    WHERE
+        P.[Type] = @PolicyType
+END
+GO