Deprecate the use of ipynbname package in our SDK

[cw75]

Describe your changes and why you are making these changes

The ipynbname has been causing issues whenever a notebook isn't started in the user's own terminal. This PR removes the use of this package and also clean up some deprecated logic in the packaging function. Please see the comments inline for the defensive check added.

Related issue number (if any)

Checklist before requesting a review

• I have created a descriptive PR title. The PR title should complete the sentence "This PR...".
• I have performed a self-review of my code.
• I have included a small demo of the changes. For the UI, this would be a screenshot or a Loom video.
• If this is a new feature, I have added unit tests and integration tests.
• I have manually run the integration tests and they are passing.
• All features on the UI continue to work correctly.

[kenxu95]

The change looks good to me! But we definitely need an integration test for when the function is in a python file in a different directory, and it makes a relative import from another directory (this may already exist but would be good to check)

Would we be able to modify one of our example notebooks to include an operator defined in a separate python file (with additional dependencies in separate files too)? We can also just create a simple example test notebook and check it with the run-notebook action.

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[cw75]

@kenxu95 could you take another look? I added a notebook integration test.

[kenxu95]

LGTM!