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fix: use configured timezone for MySQL session time_zone (#2127)

* fix: use configured timezone for MySQL session time_zone

When use_tz=True, the MySQL client was using timezone.now().utcoffset()
to compute the session time_zone offset. Since timezone.now() returns a
UTC-aware datetime, its utcoffset() is always timedelta(0), so the
session was always set to +0:00 regardless of the configured timezone.

Use get_default_timezone() to obtain the configured timezone and compute
the correct UTC offset from it.

Fixes #2114

* style: fix ruff formatting in test_connection_params.py

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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