fix(infra): Fix span convert test pollution

[rbro112]

Fixes the third largest test offender for causing shuffle-tests to break, test_convert_span_to_item. This failure was caused by an improper copy/modification of SPAN_KAFKA_MESSAGE. This modification affected tests that ran after, an in cases where test_convert_span_to_item ran after test_convert_renamed_attribute_meta, it would fail due to _meta.attributes being improperly modified by the earlier tests.

This fix now properly copies the SPAN_KAFKA_MESSAGE for testing. Confirmed fixed with a repro that failed before this fix:

 pytest tests/sentry/spans/consumers/process_segments/test_convert.py::test_convert_renamed_attribute_meta tests/sentry/spans/consumers/process_segments/test_convert.py::test_convert_span_to_item

[rbro112]

• fix(infra): Fix span convert test pollution #104661 👈 (View in Graphite)
• master

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