Fix #348: Allow ToolError to carry custom content and is_error #2325

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	17s
checks / test (3.11, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 42s
checks / test (3.10, lowest-direct, windows-latest)	2m 24s
checks / test (3.11, locked, ubuntu-latest)	44s
checks / test (3.14, locked, windows-latest)	3m 19s
checks / test (3.10, locked, windows-latest)	2m 26s
checks / test (3.11, locked, windows-latest)	2m 29s
checks / test (3.10, lowest-direct, ubuntu-latest)	43s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.13, locked, windows-latest)	2m 20s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.14, lowest-direct, windows-latest)	2m 14s
checks / test (3.10, locked, ubuntu-latest)	44s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, locked, windows-latest)	3m 35s
checks / test (3.11, lowest-direct, windows-latest)	2m 9s
all-green	3s
	37m 37s

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