Stop flagging snake_case is_error results as tool errors in OTel span #2985

Job	Run time
checks / readme-snippets	10s
checks / pre-commit	40s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.11, lowest-direct, windows-latest)	1m 26s
checks / test (3.10, locked, ubuntu-latest)	1m 3s
checks / test (3.10, locked, windows-latest)	1m 30s
checks / test (3.12, lowest-direct, windows-latest)	1m 33s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 4s
checks / test (3.11, locked, ubuntu-latest)	59s
checks / test (3.11, locked, windows-latest)	1m 28s
checks / test (3.14, lowest-direct, ubuntu-latest)	58s
checks / test (3.13, locked, ubuntu-latest)	53s
checks / test (3.14, locked, ubuntu-latest)	1m 59s
checks / test (3.14, lowest-direct, windows-latest)	1m 23s
checks / test (3.12, locked, ubuntu-latest)	1m 11s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.12, locked, windows-latest)	1m 34s
checks / test (3.10, lowest-direct, windows-latest)	1m 25s
checks / test (3.13, lowest-direct, windows-latest)	1m 37s
checks / test (3.13, locked, windows-latest)	2m 12s
checks / test (3.14, locked, windows-latest)	2m 38s
all-green	5s
	29m 3s

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