fs tests: Skip UNC path types in Dir.rename tests

Follow up to https://github.com/ziglang/zig/pull/17136. The `Dir.rename files` test has now also been seen to fail in CI, so now all rename tests are skipped for the UNC path type. This is a heavy handed approach to hopefully get rid of any flakiness related to rename & UNC paths. See https://github.com/ziglang/zig/issues/17134
742030a8f2Ryan Liptak committed on 9/14/2023, 1:30:41 PM· committed by Veikka Tuominenparent8fb4a4e
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