Add Boolean AI network settings

What does this MR do and why?

Followup to !229563 (merged) - which added the setting data to the database.

This MR makes available to the front-end the boolean settings allow_project_extension, include_recommended_allowed, enforce_on_local_clients and allow_all_unix_sockets (for both instance-level and TLG settings)

References

Relates to https://gitlab.com/gitlab-org/gitlab/-/work_items/593149

Screenshots or screen recordings

Before	After

How to set up and validate locally

From the console, check settings:

Instance level:

::Ai::Setting.instance.allow_all_unix_sockets
::Ai::Setting.instance.include_recommended_allowed
::Ai::Setting.instance.allow_project_extension
::Ai::Setting.instance.enforce_on_local_clients

Namespace level:

namespace = Group.find(1000000)
namespace.ai_settings.allow_all_unix_sockets
namespace.ai_settings.include_recommended_allowed
namespace.ai_settings.allow_project_extension
namespace.ai_settings.enforce_on_local_clients

To verify these settings are being passed to the front-end, go to the settings page (group level for SaaS, instance admin for SM), view page source and search for data-allow-all-unix-sockets, data-allow-project-extension, and data-include-recommended-allowed

MR acceptance checklist

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