Tests

test: switch to pathfinder for integration tests #1050

Job	Run time
no-std build	1m 24s
Unix tests (ubuntu-latest, stable)	1m 53s
WASM tests	4m 9s
Unix tests (ubuntu-latest, nightly)	1m 56s
Windows tests (stable, x86_64-pc-windows-gnu)	5m 59s
Unix tests (macos-11, stable)	11m 14s
Windows tests (stable, x86_64-pc-windows-msvc)	3m 39s
Unix tests (macos-11, nightly)	11m 13s
Windows tests (nightly, x86_64-pc-windows-gnu)	4m 47s
Windows tests (nightly, x86_64-pc-windows-msvc)	7m 43s
	53m 57s

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