[e2e] [BUG] Can't use data disk measured in terabytes v1.2.1

[harvesterhci-io-github-bot]

What's the test to develop? Please describe

• Boot a system with one disk < 250Gi. Verify that when you hit ENTER or DOWN on the Installation disk field that the "Installation disk size is too small. Minimum 250Gi is required" message appears.
• Boot a system with two disks, one 120Gi, one 200Gi and verify:
  • With the 120Gi disk selected for both installation and data, you see "Installation disk size is too small. Minimum 250Gi is required"
  • With the 200Gi disk selected for both installation and data, verify the same error as above appears immediately.
  • Set the 120Gi disk for data and verify the error goes away.
• In all cases, verify that an appropriate error appears immediately after you leave each field going down (down arrow or enter key) and that the error disappears when pressing the up arrow to return to the previous field.

Prerequisite and dependency of test

Just a single host (VM or bare metal), with two disks sized as above.

Describe the items of the test development (DoD, definition of done) you'd like

I'm not quite sure what to put in this section - this is essentially just a manual test. I don't know if it can be automated somehow -- @tserong

Please use a task list for items on a separate line with a clickable checkbox https://docs.github.com/en/issues/tracking-your-work-with-issues/about-task-lists

• item 1

Additional context

Add any other context or screenshots about the test request here.

related issue: harvester/harvester#4734