Merge branch 'update-cells-iteration-plans-and-workflows' into 'master'

Cells blueprint: Update iteration plans and workflows

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136756



Merged-by: Lorena Ciutacu <lciutacu@gitlab.com>
Approved-by: Manoj M J <mmj@gitlab.com>
Approved-by: Alex Pooley <apooley@gitlab.com>
Co-authored-by: Arturo Herrero <arturo.herrero@gmail.com>
Co-authored-by: Christina Lohr <clohr@gitlab.com>