Merge branch '384423-update-regestration-banner-buttons' into 'master'

Update sign-up registration buttons to pajamas

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/107327



Merged-by: Jannik Lehmann <jlehmann@gitlab.com>
Approved-by: Jannik Lehmann <jlehmann@gitlab.com>
Co-authored-by: Alexander Turinske <aturinske@gitlab.com>