Superset doesn't start when Google SDKs are installed

[skion]

A clear and concise description of what the bug is.

How to reproduce the bug

Observe that the import in bigqeuery.py results in a ModuleNotFoundError.

>>> from google.cloud import bigquery
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'google.cloud'

Install google-cloud-core, or any Google SDK which depends on it (except BigQuery):

pip install google-cloud-core

Observe that now the exception has changed to the higher-level ImportError:

>>> from google.cloud import bigquery
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'bigquery' from 'google.cloud' (unknown location)

Expected results

Missing import exception is caught and Superset loads correctly when Google SDKs have been installed but without BigQuery.

Actual results

Missing import exception is not caught, Superset doesn't load and emits the following error:

{"errors": [{"message": "cannot import name 'bigquery' from 'google.cloud' (unknown location)", "error_type": "GENERIC_BACKEND_ERROR", "level": "error", "extra": {"issue_codes": [{"code": 1011, "message": "Issue 1011 - Superset encountered an unexpected error."}]}}]}

Environment

• superset version: Superset 0.0.0-dev, git commit ff95d0f
• python version: Python 3.11.4
• node.js version: v18.13.0

Checklist

Make sure to follow these steps before submitting your issue - thank you!

• I have checked the superset logs for python stacktraces and included it here as text if there are any.
• I have reproduced the issue with at least the latest released version of superset.
• I have checked the issue tracker for the same issue and I haven't found one similar.