[Testing Framwork] Fix relative path resolution for contracts

type:fixed

This MR fixes

1. Resolution of relative paths, when the path is relative to some other imported file (not the file passed to ligo run test)
2. Fixes (Ast_aggregated.equal_type_expression) we needed to [@equal.ignore] some properties (fixes the warning Run-time warning: cast changing the type of an address. even if the types are equal)

Changelog details:

Fixes path resolution if a relative path is provided to Test.originate_from_file & Test.compile_contract_from_file & Test.read_contract_from_file