feat: Add settings support for session_expire_from_init

Omar Nasserrequested to merge
gitlab-community/gitlab-org/api/client-go:2243-support-session-expire into main

Add support for the session_expire_from_init field in the Settings API.

Closes #2243 (closed)

Needed for / Blocking: `gitlab_application_settings` resource missing ... (gitlab-org/terraform-provider-gitlab#6774)

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