Merge branch 'nadia_sotnikova-master-patch-97523' into 'master'

Feat(pipeline editor): Remove toolbar background

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/96690



Merged-by: Kushal Pandya <kushalspandya@gmail.com>
Approved-by: Ali Ndlovu <andlovu@gitlab.com>
Approved-by: Kushal Pandya <kushalspandya@gmail.com>
Co-authored-by: Deepika Guliani <dguliani@gitlab.com>
Co-authored-by: Nadia Sotnikova <nsotnikova@gitlab.com>