Fix testdata project path in Yarn tests

[eranturgeman]

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This PR fixs testdata project path in yarn tests. The local path for the tests projects was changed during the migration to security-cli but the path wasn't changed in the tests.
The tests currently pass in Prod since the machine that runs the tests contains lower yarn version (Yarn 1), that enables running 'install' on an empty directory, which causes the tests to pass without actually checking what the test is intended to check.
This is not allowed in higher yarn versions.

[github-actions]

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