Merge branch '20240502-clavimoniere-board-lane-header-sticky-fix' into 'master'

Prevent board epic lane header from moving before sticky

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/151824



Merged-by: Michael Lunøe <michael.lunoe@gmail.com>
Approved-by: Annabel Dunstone Gray <annabel.dunstone@gmail.com>
Approved-by: Marina Mosti <mmosti@gitlab.com>
Approved-by: Michael Lunøe <michael.lunoe@gmail.com>
Co-authored-by: Chad Lavimoniere <clavimoniere@gitlab.com>