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refactor: remove obsolete vendoring machinery and duplicate crate code #1454

Job	Run time
matrix (ubuntu-latest, 2018.11.26 2020.11.15 2021.11.23 2022.12.19 2023.12.1 2024.4.1 2025.1.3 20...	6m 4s
matrix (ubuntu-latest, 2022.12.19 2026.8.0, crlf marker-excluded extras category)	5m 19s
matrix-macos	-1s
	11m 22s