chore: add limit item deletion feature flag constant, refs PM-17214 (#5356)

src/Core/Constants.cs

@@ -107,6 +107,7 @@ public static class FeatureFlagKeys
     public const string VerifiedSsoDomainEndpoint = "pm-12337-refactor-sso-details-endpoint";
     public const string IntegrationPage = "pm-14505-admin-console-integration-page";
     public const string DeviceApprovalRequestAdminNotifications = "pm-15637-device-approval-request-admin-notifications";
+    public const string LimitItemDeletion = "pm-15493-restrict-item-deletion-to-can-manage-permission";
 
     public const string ReturnErrorOnExistingKeypair = "return-error-on-existing-keypair";
     public const string UseTreeWalkerApiForPageDetailsCollection = "use-tree-walker-api-for-page-details-collection";