test(options): add output file destination path validation specs

[gcoinstash-cmd]

Summary\n- Adds test coverage for Options struct configuring output file destination paths.\n\n### Testing\n- Tested with testify/assert.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between e381493 and 55fc224.

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• libs/dnsx/day3_w15_outputdir_test.go

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_{Comment @coderabbitai help to get the list of available commands.}

[dogancanbakir]

Closing: bulk automated PRs, not accepted.