test: avoid requiring Codex in Rust CI #2099

Job	Run time
Prepare	5s
Changes / Detect	8s
Check / Run	2m 59s
Check / Install script (${{ matrix.platform }})	0s
Check / Install script (Windows ${{ matrix.architecture }})	0s
Rust / Test (windows-arm64)	10m 57s
Rust / Test (macos-arm64)	4m 17s
Rust / Test (linux-amd64)	4m 37s
Rust / Test (windows-amd64)	8m 4s
Rust / Test (linux-arm64)	3m 1s
Node.js	0s
Go	0s
License Diff	0s
Python	0s
Rust / Package (macos-arm64)	3m 42s
Rust / Package (linux-arm64)	3m 40s
Rust / Package (linux-amd64)	3m 52s
Rust / Package (windows-amd64)	5m 55s
Rust / Package (windows-arm64)	5m 32s
CI Pipeline	4s
pr-builder / run	4s
Publish (crates.io)	-1s
Publish (npm)	-1s
Publish (PyPI)	-1s
Release CLI Artifacts	-1s
	56m 53s

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