Evaluate skipped system nox session for `django-google-spanner`

[ohmayr]

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Summary of the issue

We temporarily skipped the nox -s system session for django-google-spanner during the monorepo migration because they crash when run against a live Spanner instance. This is consistent to what we see in the split repo. See: googleapis/python-spanner-django#929.

These integration tests are already running successfully against the Spanner Emulator via GitHub Actions.

Decide if we should adapt these tests to support live Spanner on Kokoro, or permanently remove/repurpose the system nox session for this package to avoid CI confusion.

API client name and version

No response

Reproduction steps: code

file: main.py

   def reproduce():
    # complete code here

Reproduction steps: supporting files

file: mydata.csv

alpha,1,3
beta,2,5

Reproduction steps: actual results

file: output.txtmydata.csv

Calculated: foo

Reproduction steps: expected results

file: output.txtmydata.csv

Calculated: bar

OS & version + platform

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Python environment

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Python dependencies

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Additional context

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