[Python] Remove leftover "### Labels" debug log in the BigQuery source

[Ayoubhm07]

_CustomBigQueryStorageSource._setup_temporary_dataset logs the dataset labels at warning level, right before passing the same value to create_temporary_dataset :

beam/sdks/python/apache_beam/io/gcp/bigquery.py

Line 1152 in c74609d

_LOGGER.warning("### Labels: %s", str(self.bigquery_dataset_labels))

Three things suggest a debug print rather than an intended log line :

• ### appears in no other logging call under sdks/python/apache_beam, across its 1380 .py files
• str() is redundant with %s
• it is the only _LOGGER.warning(...) call in the module, and it reports a value the caller supplied in the first place

git blame puts the line in #15602, which added the BigQuery Read API support in October 2021, and it has not changed since

No test refers to it : the only assertLogs in io/gcp is bigquery_test.py:398, which targets a DEBUG message from bigquery_read_internal on an unrelated path
_LOGGER is still used at nine call sites in the module, so nothing becomes unused

Checked with yapf==0.43.0, the version pinned in tox.ini:294 : no diff

If you would rather keep the value visible, I am happy to demote it to debug instead of removing it

---

• Mention the appropriate issue in your description (for example: addresses #123), if applicable.
  • not applicable, no issue filed for a one-line log removal
• Update CHANGES.md with noteworthy changes.
  • not noteworthy, removing a debug log changes no behaviour and no API
• If this contribution is large, please file an Apache Individual Contributor License Agreement.
  • one line removed, no ICLA needed

[github-actions]

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R: @jrmccluskey for label python.

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[jrmccluskey]

LGTM, thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.04%. Comparing base (69bdf5f) to head (283c6c6).
⚠️ Report is 22 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #40430   +/-   ##
=========================================
  Coverage     59.04%   59.04%           
  Complexity    15624    15624           
=========================================
  Files          2797     2797           
  Lines        280750   280787   +37     
  Branches      12488    12488           
=========================================
+ Hits         165764   165796   +32     
- Misses       108540   108545    +5     
  Partials       6446     6446           

Flag	Coverage Δ
python	79.67% <ø> (+<0.01%)	⬆️

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