fix(instr-perf-hooks): avoid 'prepare' npm script because that runs on 'npm install' (open-telemetry#1955)

Having a prepare script in the monorepo means that it runs during 'npm ci'
which, I think, can break if some needed deps for that script haven't yet been
installed.

Author: trentm

Diff for: plugins/node/instrumentation-perf-hooks/package.json

@@ -13,7 +13,7 @@
     "lint:fix": "eslint . --ext .ts --fix",
     "precompile": "tsc --version && lerna run version:update --scope @opentelemetry/instrumentation-perf-hooks --include-dependencies",
     "prewatch": "npm run precompile",
-    "prepare": "npm run compile",
+    "prepublishOnly": "npm run compile",
     "test": "nyc ts-mocha -p tsconfig.json 'test/**/*.test.ts'",
     "version:update": "node ../../../scripts/version-update.js"
   },