move `tests/` to `tests/compiletests/` #422

Job	Run time
cargo-deny	54s
Test (windows-2022, x86_64-pc-windows-msvc)	26m 24s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	15m 55s
Test (macOS-latest, x86_64-apple-darwin)	12m 45s
Lint	5m 51s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	7m 45s
test_success	3s
	1h 9m 37s

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