Turn on consensus fork detection in testnet (MystenLabs#16468)

## Description 

Running in devnet for 3 months now, and no issue so far.

## Test Plan 

How did you test the new or updated feature?

---
If your changes are not user-facing and do not break anything, you can
skip the following section. Otherwise, please briefly describe what has
changed under the Release Notes section.

### Type of Change (Check all that apply)

- [ ] protocol change
- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

crates/sui-protocol-config/src/lib.rs

@@ -1897,6 +1897,11 @@ impl ProtocolConfig {
                 }
                 37 => {
                     cfg.feature_flags.reject_mutable_random_on_entry_functions = true;
+
+                    // Enable consensus digest in consensus commit prologue in testnet and devnet.
+                    if chain != Chain::Mainnet {
+                        cfg.feature_flags.include_consensus_digest_in_prologue = true;
+                    }
                 }
                 // Use this template when making changes:
                 //

crates/sui-protocol-config/src/snapshots/sui_protocol_config__test__Testnet_version_37.snap

@@ -37,6 +37,7 @@ feature_flags:
   verify_legacy_zklogin_address: true
   recompute_has_public_transfer_in_execution: true
   accept_zklogin_in_multisig: true
+  include_consensus_digest_in_prologue: true
   hardened_otw_check: true
   allow_receiving_object_id: true
   enable_coin_deny_list: true