fix(bundling): correct main field in package.json when using esbuild

[jaysoo]

This PR fixes and issue where the main field in package.json may be incorrect unless manually set.

[nx-cloud-staging]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit faf2617. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

---

✅ Successfully ran 12 targets

• nx affected --target=test --base=c57f16c28108553be25160397fd9a6b7a9074587 --head=faf261761670d5ab30549dd00244c7773ab2e94c --parallel=1
• nx-cloud record -- yarn depcheck
• nx affected --target=lint --base=c57f16c28108553be25160397fd9a6b7a9074587 --head=faf261761670d5ab30549dd00244c7773ab2e94c --parallel=3
• nx affected --target=e2e --base=c57f16c28108553be25160397fd9a6b7a9074587 --head=faf261761670d5ab30549dd00244c7773ab2e94c --exclude=e2e-storybook,e2e-storybook-angular,e2e-react-native,e2e-detox,e2e-make-angular-cli-faster --parallel=1
• nx-cloud record -- yarn nx workspace-lint
• nx-cloud record -- yarn check-lock-files
• nx affected --target=build --base=c57f16c28108553be25160397fd9a6b7a9074587 --head=faf261761670d5ab30549dd00244c7773ab2e94c --parallel=3
• nx-cloud record -- yarn check-commit
• nx-cloud record -- yarn nx format:check --base=c57f16c28108553be25160397fd9a6b7a9074587 --head=faf261761670d5ab30549dd00244c7773ab2e94c
• nx-cloud record -- yarn check-imports
• nx-cloud record -- yarn documentation
• nx build typedoc-theme

---

Sent with 💌 from NxCloud.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

1 Ignored Deployment

Name	Status	Preview	Updated
nx-dev	⬜️ Ignored (Inspect)		Sep 29, 2022 at 10:06PM (UTC)

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.