[RHOAIENG-291]: Update Mi/Gi Instance in NotebookServerDetails

[jenny-s51]

Per latest comment in https://issues.redhat.com/browse/RHOAIENG-291 cc @antowaddle

Description

Before:

After:

How Has This Been Tested?

1. Applications -> Enabled
2. Click "Launch Application".
3. Start a notebook server.
4. When notebook server is created, go to Notebook server control panel -> Notebook server details.
5. Verify units are correct.

Test Impact

N/A, tests covered in #3338

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change.

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[emilys314]

/lgtm

[openshift-ci]

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