Fix Firestore release build (#4138)

Author: schmidt-sebastian

packages/firestore/package.json

@@ -13,6 +13,7 @@
     "prebuild": "tsc --emitDeclarationOnly --declaration -p tsconfig.json && run-p api-report:exp api-report:lite",
     "build": "run-p 'bundle rollup.config.browser.js' 'bundle rollup.config.browser.memory.js' 'bundle rollup.config.node.js' 'bundle rollup.config.node.memory.js' 'bundle rollup.config.rn.js' 'bundle rollup.config.rn.memory.js' build:lite build:exp",
     "build:scripts": "tsc -moduleResolution node --module commonjs scripts/*.ts && ls scripts/*.js | xargs -I % sh -c 'terser %  -o %'",
+    "prebuild:release": "yarn prebuild",
     "build:release": "run-p 'bundle rollup.config.browser.js' 'bundle rollup.config.browser.memory.js' 'bundle rollup.config.node.js' 'bundle rollup.config.node.memory.js' 'bundle rollup.config.rn.js' 'bundle rollup.config.rn.memory.js'",
     "build:deps": "lerna run --scope @firebase/firestore --include-dependencies build",
     "build:console": "node tools/console.build.js",