Add an ability to create a new branch from the New merge request page
When you create a new merge request from the GitLab interface you have to have your branch created prior to that moment.
To avoid that GitLab could offer an interface to create a branch right away to make this a non-interruptible process.
<details><summary>Current state</summary>

</details>
<details><summary>Creating a branch from the repo home page</summary>

</details>
issue