E2E: Migrate QA::Page::Alert::StorageLimit from Chemlab

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/159910



Merged-by: Anastasia McDonald <amcdonald@gitlab.com>
Approved-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Approved-by: Alex Pooley <apooley@gitlab.com>
Approved-by: Anastasia McDonald <amcdonald@gitlab.com>
Co-authored-by: Valerie Burton <vburton@gitlab.com>