Replace npm by yarn

Author: r0qs

test/externalTests/gp2.sh

@@ -31,12 +31,12 @@ BINARY_TYPE="$1"
 BINARY_PATH="$(realpath "$2")"
 SELECTED_PRESETS="$3"
 
-function compile_fn { npm run build; }
-function test_fn { npm test; }
+function compile_fn { yarn run build; }
+function test_fn { yarn test; }
 
 function gp2_test
 {
-    local repo="https://github.com/gnosis/gp-v2-contracts.git"
+    local repo="https://github.com/cowprotocol/contracts.git"
     local ref_type=branch
     local ref=main
     local config_file="hardhat.config.ts"
@@ -67,11 +67,11 @@ function gp2_test
     force_hardhat_compiler_binary "$config_file" "$BINARY_TYPE" "$BINARY_PATH"
     force_hardhat_compiler_settings "$config_file" "$(first_word "$SELECTED_PRESETS")" "$config_var"
     force_hardhat_unlimited_contract_size "$config_file" "$config_var"
-    npm install
+    yarn
 
     # New hardhat release breaks GP2 tests, and since GP2 repository has been archived, we are pinning hardhat
     # to the previous stable version. See https://github.com/ethereum/solidity/pull/13485
-    npm install [email protected]
+    yarn add [email protected]
 
     # Some dependencies come with pre-built artifacts. We want to build from scratch.
     rm -r node_modules/@gnosis.pm/safe-contracts/build/