Hide Integrations from sidenav when no integrations have been allowed

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Context

This issue is part of Ability to disable integrations through admin s... (&15666) see that epic for more context.

In Add settings for allow-listing integrations thr... (#500610 - closed) we implemented the ability for an instance admin to allow list integrations.

Proposal

When an instance has configured their integrations allow list to block all integrations, we should:

• Hide the Integrations sidebar menu items from instance, group and project-level settings menus.
• Return a 404 page if user visits the integrations settings index pages at instance, group or project-levels.

Technical proposal

We can use a check if Integration.available_integration_names is an empty array (no integrations are available).

Hiding the menu item visibility would be in:

• instance-level
• group-level
• project-level