[vm/ffi] Native Assets infer_native_assets_yaml tests failing in AppJit

[dcharkes]

Tree is open (appjit switched to null safety)

The tests

ffi/native_assets/infer_native_assets_yaml_dart_kernel_snapshot_test
ffi/native_assets/infer_native_assets_yaml_isolate_spawnuri_2_test
ffi/native_assets/infer_native_assets_yaml_isolate_spawnuri_3_test
ffi/native_assets/infer_native_assets_yaml_isolate_spawnuri_test
ffi/native_assets/infer_native_assets_yaml_process_run_test

are failing on configurations

vm-appjit-linux-debug-x64
vm-appjit-linux-release-x64

Pass -> RuntimeError (expected Pass)

logs

PathNotFoundException: Cannot open file, path = '/b/s/w/ir/cache/builder/sdk/out/DebugX64/generated_compilations/vm-appjit-linux-debug-x64/tests_ffi_native_assets_infer_native_assets_yaml_isolate_spawnuri_3_test/infer_native_assets_yaml_isolate_spawnuri_3_helper.dart' (OS Error: No such file or directory, errno = 2)

[dcharkes]

These test weren't run in legacy mode, so it should be new -> RuntimeError.

These tests invoke the VM manually, and require the source files next to it, so running the test again as an appjit test from a different folder doesn't work. These tests should be skipped on appjit.