feat(config): add PROTOCOL_VERSION option to testnet configs

Added the PROTOCOL_VERSION environment variable to testnet.json files for
conway_fast, conway_slow, and mainnet_fast scripts. This describes specifying
the protocol version (e.g., 11 for latest Conway) when starting clusters.

Author: mkoura

src/cardonnay_scripts/scripts/conway_fast/testnet.json

@@ -8,6 +8,7 @@
         "MIXED_P2P": "if set, local cluster will use P2P for some nodes and legacy topology for others",
         "UTXO_BACKEND": "'mem' or 'disk', default is 'mem' (or legacy) if unset",
         "NO_CC": "if set, will not create committee",
-        "DRY_RUN": "if set, will not start the cluster"
+        "DRY_RUN": "if set, will not start the cluster",
+        "PROTOCOL_VERSION": "if set, will use the specified protocol version (e.g., 11 for latest Conway, etc.)"
     }
 }

src/cardonnay_scripts/scripts/conway_slow/testnet.json

@@ -8,6 +8,7 @@
         "MIXED_P2P": "if set, local cluster will use P2P for some nodes and legacy topology for others",
         "UTXO_BACKEND": "'mem' or 'disk', default is 'mem' (or legacy) if unset",
         "NO_CC": "if set, will not create committee",
-        "DRY_RUN": "if set, will not start the cluster"
+        "DRY_RUN": "if set, will not start the cluster",
+        "PROTOCOL_VERSION": "if set, will use the specified protocol version (e.g., 11 for latest Conway, etc.)"
     }
 }

src/cardonnay_scripts/scripts/mainnet_fast/testnet.json

@@ -8,6 +8,7 @@
         "MIXED_P2P": "if set, local cluster will use P2P for some nodes and legacy topology for others",
         "UTXO_BACKEND": "'mem' or 'disk', default is 'mem' (or legacy) if unset",
         "NO_CC": "if set, will not create committee",
-        "DRY_RUN": "if set, will not start the cluster"
+        "DRY_RUN": "if set, will not start the cluster",
+        "PROTOCOL_VERSION": "if set, will use the specified protocol version (e.g., 11 for latest Conway, etc.)"
     }
 }