Test maintenance: re-enable asset_test.go tests that are skipped on Windows

[t0yv0]

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Issue details

Currently a few asset_test.go tests are skipped on Windows. I've put some work into fixing them but it's a bit involved and the passing tests on my Windows test machine did not result in a passing PR, so backlogging it here for the moment.

The key issues are:

• sometimes git checks out test data files with CRLF, affecting checksums and asserts in the tests
• tests assume /dev/null exists
• there are issues with path asserts \ based paths instead of / based paths
• there are issues with constructing file URLs from paths containing C: drive prefix

While most of the issues are test-only, there is something suspicious around asserts against paths of the packed files in an Archive.. That is we probably want Archives generated on Windows to be identical to the ones generated on Linux/Mac so they are portable across OS-es, this is something worth double-checking.

Steps to reproduce

Expected:
Actual: