Add temporary try-catch to handle snapshot time parsing issue

[mars-lan]

🤔 Why?

A bug in google-cloud-bigquery caused the bigquery connector to throw the following error when processing some snapshot tables:

  File "/usr/local/lib/python3.8/site-packages/google/cloud/bigquery/table.py", line 976, in snapshot_definition
    snapshot_info = SnapshotDefinition(snapshot_info)
  File "/usr/local/lib/python3.8/site-packages/google/cloud/bigquery/table.py", line 1372, in __init__
    self.snapshot_time = google.cloud._helpers._rfc3339_to_datetime(
  File "/usr/local/lib/python3.8/site-packages/google/cloud/_helpers/__init__.py", line 252, in _rfc3339_to_datetime
    return datetime.datetime.strptime(dt_str, _RFC3339_MICROS).replace(tzinfo=UTC)
  File "/usr/local/lib/python3.8/_strptime.py", line 568, in _strptime_datetime
    tt, fraction, gmtoff_fraction = _strptime(data_string, format)
  File "/usr/local/lib/python3.8/_strptime.py", line 349, in _strptime
    raise ValueError("time data %r does not match format %r" %
ValueError: time data '2024-07-23T09:09:09Z' does not match format '%Y-%m-%dT%H:%M:%S.%fZ'

🤓 What?

Add a try-catch around snapshot time retrieval.

🧪 Tested?

Verified against a production instance with known issues.

☑️ Checks

• My PR contains actual code changes, and I have updated the version number in pyproject.toml.

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
11721	10418	89%	85%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
metaphor/bigquery/extractor.py	78%	🟢
TOTAL	78%	🟢

updated for commit: e42eab2 by action🐍

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 88.81%. Comparing base (d1e39ee) to head (810c06b).

Files	Patch %	Lines
metaphor/bigquery/extractor.py	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #933      +/-   ##
==========================================
- Coverage   88.85%   88.81%   -0.05%     
==========================================
  Files         178      178              
  Lines       11556    11565       +9     
==========================================
+ Hits        10268    10271       +3     
- Misses       1288     1294       +6     

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