ci: apply free-disk-space on tests

[dwisiswant0]

Proposed changes

Tbh have no idea why this ends up being OS-specific. It kinda started happening after GitHub pinned ubuntu-latest to ubuntu-24.04, which has become significantly more bloated, but that’s just me guessing, still needs proper checking.
More context: could also be from the Go tools cache(?) (~3 GiB rn). Not sure if it keeps growing, but AFAIK, it shouldn’t since the cache is based on the go.sum hash. I'm confused lmao.

re: https://github.com/projectdiscovery/nuclei/actions/runs/19766522640/job/56640731129?pr=6629

Checklist

• Pull request is created against the dev branch
• All checks passed (lint, unit/integration/regression tests etc.) with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[coderabbitai]

Important

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dwisiswant0/ci/tests/apply-free-disk-space-on-tests

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[dwisiswant0]

https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md vs. https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md