Merge branch '451275-add-backfill-instructions-to-vsa' into 'master'

Add reaggregation instructions for VSA

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147991



Merged-by: Lorena Ciutacu <lciutacu@gitlab.com>
Reviewed-by: Lorena Ciutacu <lciutacu@gitlab.com>
Co-authored-by: Adam Hegyi <ahegyi@gitlab.com>