Separate Code Suggestions telemetry details from connection details

Problem

Telemetry attributes like gitlab_instance_id and gitlab_hostname are missing if instance does not have direct access to AI GW.

Context

Currently, telemetry attributes like gitlab_instance_id and gitlab_host_name are only fetched when Direct Connection to the AI GW is enabled. This is not ideal because we want to be able to see usage numbers when connections go through GitLab monolith too.

fix: Keep connection details global context (gitlab-org/editor-extensions/gitlab-lsp!1950 - merged) tried to fix that, but we can't really have a final solution using direct_access endpoint so we need a new endpoint to expose only the connection details for any user.

Proposal

Create a new endpoint to expose the following attributes:

• gitlab_instance_id
• gitlab_realm
• gitlab_global_user_id
• gitlab_host_name
• gitlab_feature_enablement_type
• gitlab_saas_duo_pro_namespace_ids

All these attributes are already exposed in the direct_access endpoint and we should reuse whatever it is available there.