BYON Improvements Phase 1 to main

[andrewballantyne]

Closes: #1254

Description

Merges the phase 1 improvements to the Custom Notebook

How Has This Been Tested?

Manually and through existing tests.

More will need to be done on cluster to verify parity.

Test Impact

Tests exist now for the feature, this PR just merges into main.

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• 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 tests & storybook 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 (find relevant UX in the SMEs section).

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

[andrewballantyne]

/hold

Until proper sign-offs

[DaoDaoNoCode]

/lgtm
Looked through the code and tested on the cluster, worked great and nothing is broken.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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