test(tracing): Simplify static/classmethod tracing tests

[szokeasaurusrex]

Port of #4278 for POTel.

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[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
20655	1	20654	4419

View the top 1 failed test(s) by shortest run time

tests.integrations.django.test_cache_module test_cache_spans_get_span_description[get-args4-kwargs4-]

Stack Traces | 0.004s run time

.../integrations/django/test_cache_module.py:386: in test_cache_spans_get_span_description
    assert _get_span_description(method_name, args, kwargs) == expected_description
E   AssertionError: assert '1a\\ά\x18Hň\x7f@w$,H]' == ''
E     + 1a\ά#x18Hň�@w$,H]

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