chore: use testcontext for mock tests #228

Job	Run time
Lint	46s
dependency-review	13s
Test with Node.js 24 compiled --without-intl	12m 8s
Test with Node.js 22 compiled --without-intl	13m 51s
Fuzzing	3m 30s
Test with Node.js 20 compiled --without-intl	10m 1s
Test TypeScript types	51s
Test with Node.js 20 on macos-latest / Test with Node.js 20 on macos-latest	10m 12s
Test with Node.js 24 on ubuntu-latest / Test with Node.js 24 on ubuntu-latest	12m 4s
Test with Node.js 24 on windows-latest / Test with Node.js 24 on windows-latest	14m 53s
Test with Node.js 20 on ubuntu-latest / Test with Node.js 20 on ubuntu-latest	11m 49s
Test with Node.js 22 on ubuntu-latest / Test with Node.js 22 on ubuntu-latest	11m 28s
Test with Node.js 22 on windows-latest / Test with Node.js 22 on windows-latest	16m 58s
Test with Node.js 22 on macos-latest / Test with Node.js 22 on macos-latest	9m 34s
Test with Node.js 24 on macos-latest / Test with Node.js 24 on macos-latest	10m 6s
Test with Node.js 24 on ubuntu-latest with WASM SIMD disabled / Test with Node.js 24 on ubuntu-latest	10m 38s
Test with Node.js 20 compiled --shared-builtin-undici/undici-path / Test with Node.js 20 compiled --shared-builtin-undici/undici-path	12m 24s
Test with Node.js 22 compiled --shared-builtin-undici/undici-path / Test with Node.js 22 compiled --shared-builtin-undici/undici-path	11m 34s
Test with Node.js 24 compiled --shared-builtin-undici/undici-path / Test with Node.js 24 compiled --shared-builtin-undici/undici-path	11m 57s
automerge	0s
	3h 4m 57s

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