Reserved storage size in the dashboard isn't useful

[votdev]

Summary

PR Checklist

• Is this a multi-tenancy feature/bug?
  • [ ] Yes, the relevant RBAC changes are at:
• Do we need to backport changes to the old Rancher UI, such as RKE1?
  • [ ] Yes, the relevant PR is at:
• Are backend engineers aware of UI changes?
  • [ ] Yes, the backend owner is:

Related Issue # https://github.com/harvester/harvester/issues/6362

Occurred changes and/or fixed issues

Technical notes summary

Areas or cases that should be tested

Areas which could experience regressions

Screenshot/Video