Improve error message for absolute relative imports #4408
Description
The PR #4268 disallows absolute relative imports, but the error is not really helpful if the disallowed import is somewhere nested in some imported modules or interface files; e.g.:
Error compiling: src/snekmate/tokens/mocks/erc1155_mock.vy
FileNotFoundError: could not find IERC1155.vy in any of the following locations:
/../snekmate/src/snekmate/tokens/mocks/IERC1155.vy
IERC1155.vy
/../.pyenv/versions/3.12.3/bin/IERC1155.vy
/../.pyenv/versions/3.12.3/lib/python312.zip/IERC1155.vy
/../.pyenv/versions/3.12.3/lib/python3.12/IERC1155.vy
/../.pyenv/versions/3.12.3/lib/python3.12/lib-dynload/IERC1155.vy
/../.local/lib/python3.12/site-packages/IERC1155.vy
/../.pyenv/versions/3.12.3/lib/python3.12/site-packages/IERC1155.vy
The above exception was the direct cause of the following exception:
vyper.exceptions.ModuleNotFound: IERC1155