fix: show Order History link only when MFE is configured

[Lunyachek]

Description

This PR updates the logic that controls the visibility of the Order History link in the LMS user dropdown menu.

Previously, the link was shown whenever the user was not associated with an enterprise portal:

should_show_order_history = not enterprise_customer_portal

With this change, the link is only shown if:

• The user is not associated with an enterprise portal, and
• settings.ORDER_HISTORY_MICROFRONTEND_URL is configured.

This ensures that the Order History link only appears when the new Order History MFE is enabled and available, avoiding broken links.

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