Allow to set initial default branch name for new personal projects based on user profile settings
### Proposal
Allow to set initial default branch name for new personal projects based on user profile settings.
This feature already exist in GitHub [Managing the default branch name for your repositories](https://docs.github.com/en/github/setting-up-and-managing-your-github-user-account/managing-user-account-settings/managing-the-default-branch-name-for-your-repositories) but is missing in GitLab.
Based on this comment https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/1356#note_517547108 currently it is possible only at the instance level (self-hosted) and the group-level. Official GitLab documentation also confirms this [Default branch](https://docs.gitlab.com/13.11/ee/user/project/repository/branches/default.html).
```plaintext
currently users can change this both at the instance-level (for self-managed users) and at the group-level (both SaaS and self-managed users).
```
Related issues:
- https://gitlab.com/gitlab-org/gitlab/-/issues/221164
- https://gitlab.com/gitlab-com/gl-infra/delivery/-/issues/1356
- https://gitlab.com/gitlab-org/gitlab/-/issues/331773
issue