[crypto] feat: remove BLS12-377 (MystenLabs#5443)

* feat: remove BLS12-377

BLS12-377 was introduced in MystenLabs/narwhal#36 as a PoC demonstrating the ability to use Narwhal with https://github.com/celo-org/celo-bls-snark-rs, a specific implementation of BLS12-377.
Due to idiosyncracies of this implementation (outlined in celo-org/celo-bls-snark-rs#228), this required using a fork (https://github.com/huitseeker/celo-bls-snark-rs), which is less than ideal. Further, the org behind the original implementation has other plans (https://github.com/celo-org/bls-crypto).

With MystenLabs/fastcrypto#136, MystenLabs/fastcrypto#143 and MystenLabs/fastcrypto#144, BLS12-377 is supported as part of our fastcrypto library.
The present implementation is obsolete.

* fix: remove obsolete Narwhal-celo crypto tests

.github/workflows/rust.yml

@@ -73,10 +73,6 @@ jobs:
       - name: cargo test
         run: |
           cargo nextest run --profile ci
-      - name: narwhal celo crypto tests
-        run: |
-          cargo nextest run --features celo --profile ci -p narwhal-crypto
-          cargo test --doc --features celo -p narwhal-crypto
       - name: Doctests
         run: |
           cargo test --doc