Add settings support for session_expire_from_init
Add support for the `session_expire_from_init` field in the [Settings API](https://docs.gitlab.com/api/settings/). ## Implementation Guide - Follow the `CONTRIBUTING.md` guide for setting up your local development environment. - Clone the community fork of this project. - In `settings.go`, add a new field called `SessionExpireFromInit` to the `Settings` and `UpdateSettingsOptions` structs.
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