[DDW-1127] New Yarn scripts to enter nix-shells for new test envs

Author: michalrus

package.json

@@ -62,8 +62,9 @@
     "clear:translations": "rimraf ./translations/messages",
     "nix:mainnet": "./nix/yarn-nix-shell.sh mainnet mainnet",
     "nix:flight": "./nix/yarn-nix-shell.sh mainnet mainnet_flight",
+    "nix:preview": "./nix/yarn-nix-shell.sh preview preview",
+    "nix:preprod": "./nix/yarn-nix-shell.sh preprod preprod",
     "nix:selfnode": "./nix/yarn-nix-shell.sh selfnode selfnode",
-    "nix:testnet": "./nix/yarn-nix-shell.sh testnet testnet",
     "byron:wallet:importer": "yarn node-swc utils/api-importer/byron-wallet-importer.ts",
     "shelley:wallet:importer": "yarn node-swc utils/api-importer/shelley-wallet-importer.ts",
     "mary:wallet:importer": "yarn node-swc utils/api-importer/mary-wallet-importer.ts",