Preserve entrypoint filename when building a Worker with --outdir

[GregBrimble]

What this PR solves / how to test:

npx wrangler publish --dry-run --outdir dist --assets public src/foo.ts should produce a dist/foo.js rather than dist/<internal-facade-name>.js

Associated docs issues/PR:

• Fixes 🐛 BUG: Entrypoint filename is not preserved when building with --outdir #2835

Author has included the following, where applicable:

• Tests
• Changeset

Reviewer has performed the following, where applicable:

• Checked for inclusion of relevant tests
• Checked for inclusion of a relevant changeset
• Checked for creation of associated docs updates
• Manually pulled down the changes and spot-tested

Fixes # [insert issue number].

[changeset-bot]

🦋 Changeset detected

Latest commit: 92a3118

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

This PR includes changesets to release 1 package

Name	Type
wrangler	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/4355114628/npm-package-wrangler-2836

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/2836/npm-package-wrangler-2836

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/4355114628/npm-package-wrangler-2836 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/4355114628/npm-package-cloudflare-pages-shared-2836

Note that these links will no longer work once the GitHub Actions artifact expires.

[petebacondarwin]

LGTM on the surface but CI does not agree...

[codecov]

Codecov Report

Merging #2836 (def59b0) into main (8d462c0) will increase coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head def59b0 differs from pull request most recent head 92a3118. Consider uploading reports for the commit 92a3118 to get more accurate results

@@            Coverage Diff             @@
##             main    #2836      +/-   ##
==========================================
+ Coverage   73.93%   73.96%   +0.03%     
==========================================
  Files         166      166              
  Lines       10250    10251       +1     
  Branches     2744     2745       +1     
==========================================
+ Hits         7578     7582       +4     
+ Misses       2672     2669       -3     

Impacted Files	Coverage Δ
packages/wrangler/src/bundle.ts	92.99% <100.00%> (+0.03%)	⬆️
packages/wrangler/src/git-client.ts	43.75% <0.00%> (+4.16%)	⬆️
...ackages/wrangler/src/__tests__/helpers/mock-bin.ts	100.00% <0.00%> (+5.26%)	⬆️