tari-project / bulletproofs-plus / 5644557389

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ci: speed up tests (#49)

Tests run slowly on CI. This happens for three reasons:
- Integration tests run over a matrix of extension degrees, bit lengths,
and batch structures.
- The document test runs over a batch of four proofs.
- CI is configured to run debug and release tests with and without
features, even though this crate no longer uses features; this means all
`nightly` tests are run identically twice.

This PR speeds up testing and improves CI. It does a few things:
- Reduces the integration test matrix complexity by using smaller
batches and fewer bit lengths.
- Simplifies the batching used for the document test.
- Removes duplicate tests from CI.
- Adds `check` and reorders testing jobs for faster failure.
- Removes an unused utility file; this wasn't directly related to
testing, but it seemed like a good time to remove it.

These changes reduce CI testing time by about half.

4 of 4 new or added lines in 1 file covered. (100.0%)

1820 of 2005 relevant lines covered (90.77%)

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