[MINOR] Reenable notebooks

[Mark2000]

Description

Seems like the CI decided to start working again?

[Copilot]

Pull Request Overview

This PR re-enables notebook functionality by reactivating tests and updating associated documentation and configuration files. Key changes include:

• Re-enabling the previously skipped test in tests/unittest/utils/test_orbital.py.
• Removing outdated warning documentation regarding notebook builds in examples/_default.rst.
• Updating documentation configuration in docs/source/conf.py by commenting out the nbsphinx_execute setting.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/unittest/utils/test_orbital.py	Removal of the skip decorator to re-enable tests
examples/_default.rst	Removal of the warning block related to notebook build issues
docs/source/conf.py	Commenting out nbsphinx_execute configuration as a temporary measure

Comments suppressed due to low confidence (3)

examples/_default.rst:2

• Since the warning block for notebook builds has been removed, please update the documentation to clearly reflect the current support status of notebooks.

========

docs/source/conf.py:57

• [nitpick] If the nbsphinx_execute setting is no longer necessary, consider removing the commented-out line altogether to maintain a clean configuration file.

# nbsphinx_execute = "never"

tests/unittest/utils/test_orbital.py:208

• [nitpick] The removal of the skip marker is intentional; however, ensure that any intermittent failures specific to the GitHub environment have been addressed or consider using conditional skips to prevent test flakiness.

        )

[LorenzzoQM]

Hopefully the CI will stay happy and working.