Upgrade fastzip to v0.1.8

What does this MR do?

• Updates fastzip so that it's compatible with newer versions of klauspost/compress, which updated a now deprecated call incorrectly: https://github.com/klauspost/compress/pull/502

  Newer versions of fastzip no longer use the deprecated function, so has fixed the issue, without requiring https://github.com/klauspost/compress/pull/502 to be merged yet.

• Includes a test that produces an artifact and then extracts it, testing the content matches.

Why was this MR needed?

Fastzip was creating malformed zip files.

What's the best way to test this MR?

• Create a job with a large artifact and it should no longer be invalid.
• Fastzip has test coverage and the regression has been fixed: https://github.com/saracen/fastzip/actions/runs/1878454823
• Trigger failure with test using old dependency:

  # works fine
  go test -v -run TestZipArchiveExtract ./commands/helpers
  
  # downgrade to a non-fixed fastzip + a non-fixed klauspost/compress
  go get -u github.com/saracen/fastzip@v0.1.6 github.com/klauspost/compress@v1.13.6 
  
  # test should now fail
  go test -v -run TestZipArchiveExtract ./commands/helpers

What are the relevant issue numbers?

Closes #28903 (closed)