Replace slugifyWithHyphens with improved slugify text util
- Rename
slugifyWithHyphens
toslugify
- Remove non-allowed special characters with
slugify
to avoid showing user error messages when entering a New Project title
Original MR and discussion on GitLab EE - https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/10570/commits#diff-content-3615f97ae2e91843d72a93ad2f9fd5fa7ca68a67