[PM-32131] Add UseMyItems organization ability (#7014)

Purpose: UseMyItems is a new organization ability / plan flag
which is automatically enabled where UsePolicies is enabled,
but can be selectively disabled to disable My Items creation
when the Organization Data Ownership policy is turned on.

- new organization table column with all sprocs and views updated
- data migration to enable the feature for all organizations that already use policies (replicating existing behaviour)
- data and api models updated
- added to organization license file so it can be preserved in self-hosted instances
- note that we don't have a plan feature defined for this yet, so it is set based on UsePolicies to match the migration logic. Billing Team have a ticket to add this

test/Infrastructure.IntegrationTest/AdminConsole/Migrations/UseMyItemsDataMigrationTests.cs

@@ -0,0 +1,76 @@
+using Bit.Core.AdminConsole.Entities;
+using Bit.Core.Repositories;
+using Bit.Infrastructure.IntegrationTest.Services;
+using Xunit;
+
+namespace Bit.Infrastructure.IntegrationTest.AdminConsole.Migrations;
+
+public class UseMyItemsDataMigrationTests
+{
+    private const string _migrationName = "UseMyItemsDataMigration";
+
+    [Theory, DatabaseData(MigrationName = _migrationName)]
+    public async Task Migration_WithUsePoliciesEnabled_SetsUseMyItemsToTrue(
+        IOrganizationRepository organizationRepository,
+        IMigrationTesterService migrationTester)
+    {
+        // Arrange
+        var organization = await SetupOrganization(organizationRepository, usePolicies: true);
+
+        // Verify initial state
+        Assert.True(organization.UsePolicies);
+        Assert.False(organization.UseMyItems);
+
+        // Act
+        migrationTester.ApplyMigration();
+
+        // Assert
+        var migratedOrganization = await organizationRepository.GetByIdAsync(organization.Id);
+        Assert.NotNull(migratedOrganization);
+        Assert.True(migratedOrganization.UsePolicies);
+        Assert.True(migratedOrganization.UseMyItems);
+    }
+
+    [Theory, DatabaseData(MigrationName = _migrationName)]
+    public async Task Migration_WithUsePoliciesDisabled_LeavesUseMyItemsFalse(
+        IOrganizationRepository organizationRepository,
+        IMigrationTesterService migrationTester)
+    {
+        // Arrange
+        var organization = await SetupOrganization(organizationRepository, usePolicies: false);
+
+        // Verify initial state
+        Assert.False(organization.UsePolicies);
+        Assert.False(organization.UseMyItems);
+
+        // Act
+        migrationTester.ApplyMigration();
+
+        // Assert
+        var migratedOrganization = await organizationRepository.GetByIdAsync(organization.Id);
+        Assert.NotNull(migratedOrganization);
+        Assert.False(migratedOrganization.UsePolicies);
+        Assert.False(migratedOrganization.UseMyItems);
+    }
+
+    /// <summary>
+    /// Helper method to create a test organization with specified UsePolicies value.
+    /// UseMyItems is always initialized to false to simulate pre-migration state.
+    /// </summary>
+    private static async Task<Organization> SetupOrganization(
+        IOrganizationRepository organizationRepository,
+        bool usePolicies,
+        string identifier = "test")
+    {
+        // CreateTestOrganizationAsync sets UsePolicies = true by default
+        var organization = await organizationRepository.CreateTestOrganizationAsync(identifier: identifier);
+
+        // Override to test both true and false scenarios
+        organization.UsePolicies = usePolicies;
+        organization.UseMyItems = false; // Simulate pre-migration state
+
+        await organizationRepository.ReplaceAsync(organization);
+
+        return organization;
+    }
+}