[INTERNAL] npm: Enable 'ignore-scripts' config

.npmrc

@@ -1,2 +1,3 @@
 # Enforce public npm registry
 registry = https://registry.npmjs.org/
+ignore-scripts=true

package.json

@@ -41,11 +41,11 @@
 		"unit": "ava",
 		"unit-watch": "ava --watch",
 		"coverage": "nyc ava --node-arguments=\"--experimental-loader=@istanbuljs/esm-loader-hook\"",
-		"integration": "ava --config ava-integration.config.js",
-		"integration-internet-explorer": "ava --config ava-integration.config.js -- --browsers=IE",
-		"integration-saucelabs": "ava --config ava-integration.config.js -- --useSauceLabs=true",
+		"integration-prepare": "npx puppeteer browsers install chrome && webpack",
+		"integration": "npm run integration-prepare && ava --config ava-integration.config.js",
+		"integration-internet-explorer": "npm run integration-prepare && ava --config ava-integration.config.js -- --browsers=IE",
+		"integration-saucelabs": "npm run integration-prepare && ava --config ava-integration.config.js -- --useSauceLabs=true",
 		"dev": "webpack --watch --mode=development",
-		"prepare": "webpack",
 		"preversion": "npm test",
 		"version": "git-chglog --next-tag v$npm_package_version -o CHANGELOG.md && git add CHANGELOG.md",
 		"prepublishOnly": "git push --follow-tags",