Add basic Rust support for internal testing #2441

Job	Run time
Resolve environment (ubuntu-latest, stable-v2.13.5)	38s
Resolve environment (macos-12, stable-v2.13.5)	2m 37s
Resolve environment (windows-latest, stable-v2.13.5)	2m 42s
Resolve environment (ubuntu-latest, default)	56s
Resolve environment (macos-latest, default)	2m 42s
Resolve environment (windows-latest, default)	2m 7s
Resolve environment (ubuntu-latest, linked)	58s
Resolve environment (macos-latest, linked)	1m 52s
Resolve environment (windows-latest, linked)	3m 8s
Resolve environment (ubuntu-latest, nightly-latest)	50s
Resolve environment (macos-latest, nightly-latest)	1m 51s
Resolve environment (windows-latest, nightly-latest)	6m 46s
	27m 7s

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