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 but is missing in GitLab.

Based on this comment gitlab-com/gl-infra/delivery#1356 (comment 517547108) currently it is possible only at the instance level (self-hosted) and the group-level. Official GitLab documentation also confirms this Default branch.

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
• gitlab-com/gl-infra/delivery#1356 (closed)
• #331773 (closed)