Merge branch 'vij-add-dashboard-limit-helper-method' into 'master'

Adds dashboard storage size calculation method

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138331



Merged-by: Vladimir Shushlin <vshushlin@gitlab.com>
Approved-by: Mohamed Hamda <mhamda@gitlab.com>
Approved-by: Vladimir Shushlin <vshushlin@gitlab.com>
Reviewed-by: Mohamed Hamda <mhamda@gitlab.com>
Co-authored-by: Vijay Hawoldar <vhawoldar@gitlab.com>