remove prepare from analytics-exp

Author: Feiyang1

packages-exp/analytics-exp/package.json

@@ -20,7 +20,6 @@
     "test:ci": "node ../../scripts/run_tests_in_ci.js -s test:all",
     "test:browser": "karma start --single-run --nocache",
     "test:integration": "karma start ./karma.integration.conf.js --single-run --nocache",
-    "prepare": "yarn build",
     "api-report": "api-extractor run --local --verbose",
     "predoc": "node ../../scripts/exp/remove-exp.js temp",
     "doc": "api-documenter markdown --input temp --output docs",