Remove reqwest re-exports from eth2 (#8829)

Remove `reqwest` from being re-exported within `eth2`


Co-Authored-By: Mac L <mjladson@pm.me>

testing/validator_test_rig/Cargo.toml

@@ -7,6 +7,7 @@ edition = { workspace = true }
 eth2 = { workspace = true }
 mockito = { workspace = true }
 regex = { workspace = true }
+reqwest = { workspace = true }
 sensitive_url = { workspace = true }
 serde_json = { workspace = true }
 tracing = { workspace = true }