Improve formatting of multiline errors #857

Job	Run time
test-sdist	1m 22s
Run 'mypy' on python 3.x	24s
Run 'twine-check' on python 3.x	41s
Run 'py-mindeps' on python 3.8	34s
Self-Check	17s
ensure-catalog-matches-hook-config	23s
Run tests on ubuntu-latest, py3.8	40s
Run tests on ubuntu-latest, py3.9	51s
Run tests on ubuntu-latest, py3.10	48s
Run tests on ubuntu-latest, py3.11	34s
Run tests on windows-latest, py3.8	1m 34s
Run tests on windows-latest, py3.9	1m 47s
Run tests on windows-latest, py3.10	1m 55s
Run tests on windows-latest, py3.11	1m 37s
Run tests on macos-latest, py3.8	1m 17s
Run tests on macos-latest, py3.9	1m 51s
Run tests on macos-latest, py3.10	5m 16s
Run tests on macos-latest, py3.11	59s
Collate results to check for skipped tests	10s
	23m 0s

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