fix: improve error message when the entrypoint is incorrect

[dario-piotrowicz]

Fixes https://jira.cfdata.org/browse/DEVX-2304

This PR simple slightly improves the wording of errors being thrown when an entrypoint configuration is incorrect, hopefully providing more clear and actionable errors to users.

---

• Tests
  • [x] Tests included
  • [ ] Tests not necessary because:
• Public documentation
  • [ ] Cloudflare docs PR(s):
  • [x] Documentation not necessary because: UX improvement not requiring documentation
• Wrangler V3 Backport
  • [x] Wrangler PR: https://github.com/cloudflare/workers-sdk/pull/11406
  • [ ] Not necessary because:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: abf5042f41e3cba07389c7e14387407bcdae9dc5

The changes in this PR will be included in the next version bump.

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commit: abf5042

[github-actions[bot]]

Failed to automatically backport this PR's changes to Wrangler v3. Please manually create a PR targeting the v3-maintenance branch with your changes. Thank you for helping us keep Wrangler v3 supported!

Depending on your changes, running git rebase --onto v3-maintenance main dario/DEVX-2304/wrangler-deploy-entrypoint-error-warning might be a good starting point.

Notes:

• your PR branch should be named v3-backport-11350
• add the skip-v3-pr label to the current PR to stop this workflow from failing