Context

The Go CI workflow uploads code coverage to Codecov. It's currently failing: https://github.com/celestiaorg/nmt/actions/runs/8725099979/job/23937249648

Proposal

Either:

1. Investigate the CodeCov failure and fix it
2. Remove CodeCov integration

Separately, consider extracting CodeCov to a separate workflow because Go build shouldn't fail if uploading code coverage fails.