test: hoist random_secret_key import to the test module

Author: partylikeits1983

crates/miden-testing/src/mock_chain/chain.rs

@@ -1270,6 +1270,7 @@ mod tests {
         ACCOUNT_ID_PUBLIC_FUNGIBLE_FAUCET,
         ACCOUNT_ID_SENDER,
     };
+    use miden_protocol::testing::random_secret_key::random_secret_key;
     use miden_standards::account::wallets::BasicWallet;
 
     use super::*;
@@ -1287,8 +1288,6 @@ mod tests {
 
     #[test]
     fn validator_key_rotation_across_blocks() -> anyhow::Result<()> {
-        use miden_protocol::testing::random_secret_key::random_secret_key;
-
         let mut chain = MockChain::new();
         let original_key = chain.validator_key();
 
@@ -1318,8 +1317,6 @@ mod tests {
 
     #[test]
     fn proposed_block_serialization_round_trip() -> anyhow::Result<()> {
-        use miden_protocol::testing::random_secret_key::random_secret_key;
-
         let chain = MockChain::new();
         let timestamp = chain.latest_block_header().timestamp() + 1;
         let next_key = random_secret_key().public_key();