Support compatibility sessions that do not have devices #1622

Job	Run time
Lint and test OPA policies	5s
Run the frontend test suite	34s
Check schema	6m 18s
Run `cargo deny` checks	26s
Check the frontend for unused dependencies	26s
Check frontend style	33s
Check Rust style	13s
Compile test artifacts	5m 9s
Check syn2mas	18s
Run Clippy	2m 55s
Run test suite with Rust stable (1)	1m 51s
Run test suite with Rust stable (2)	2m 11s
Run test suite with Rust stable (3)	1m 41s
Tests done	2s
	22m 42s

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