Delete milagro library (#5298)

* fix lib.rs and tests.rs

* update decode.rs

* auto-delete in Cargo.lock

* delete milagro in cargo.toml

* remove milagro from makefile

* remove milagro from the name

* delete milagro in comment

* delete milagro in cargo.toml

* delete in /testing/ef_tests/cargo.toml

* delete milagro in the logical OR

* delete milagro in /lighthouse/src/main.rs

* delete milagro in /crypto/bls/tests/tests.rs

* delete milagro in comment

* delete milagro in /testing//ef_test/src//cases/bls_eth_aggregate_pubkeys.rs

* delete milagro

* delete more in lib.rs

* delete more in lib.rs

* delete more in lib.rs

* delete milagro in /crypto/bls/src/lib.rs

* delete milagro in crypto/bls/src/mod.rs

* delete milagro.rs

testing/ef_tests/Cargo.toml

@@ -7,7 +7,6 @@ edition = { workspace = true }
 [features]
 # `ef_tests` feature must be enabled to actually run the tests
 ef_tests = []
-milagro = ["bls/milagro"]
 fake_crypto = ["bls/fake_crypto"]
 portable = ["beacon_chain/portable"]