fix: make wrangler types always generate a d.ts file for module worders

[dario-piotrowicz]

What this PR solves / how to test:

Currently if a config file doesn't define any binding nor module, running
wrangler types against such file would not produce a d.ts file.

Producing a d.ts file can however still be beneficial as it would define a correct
env interface (even if empty) that can be expanded/referenced by user code (this can
be particularly convenient for scaffolding tools that may want to always generate an
env interface).

Example:
Before wrangler types --env-interface MyEnv run with an empty wrangler.toml file
would not generate any file, after these change it would instead generate a file with
the following content:

interface MyEnv {
}

Author has addressed the following:

• Tests
  • Included
  • Not necessary because:
• Changeset (Changeset guidelines)
  • Included
  • Not necessary because:
• Associated docs
  • Issue(s)/PR(s):
  • Not necessary because: this is a quality of life improvement that doesn't require documentation

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[changeset-bot]

🦋 Changeset detected

Latest commit: 9a9974d

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	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/8053372881/npm-package-wrangler-5087

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5087/npm-package-wrangler-5087

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8053372881/npm-package-wrangler-5087 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8053372881/npm-package-create-cloudflare-5087 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8053372881/npm-package-cloudflare-kv-asset-handler-5087

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8053372881/npm-package-miniflare-5087

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8053372881/npm-package-cloudflare-pages-shared-5087

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8053372881/npm-package-cloudflare-vitest-pool-workers-5087

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

---

wrangler@3.29.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240208.0
workerd	1.20240208.0	1.20240208.0
workerd --version	1.20240208.0	2024-02-08

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.38%. Comparing base (cab7e1c) to head (9a9974d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5087      +/-   ##
==========================================
+ Coverage   70.33%   70.38%   +0.04%     
==========================================
  Files         298      298              
  Lines       15515    15516       +1     
  Branches     3987     3988       +1     
==========================================
+ Hits        10913    10921       +8     
+ Misses       4602     4595       -7     

Files	Coverage Δ
packages/wrangler/src/type-generation.ts	99.20% <100.00%> (+<0.01%)	⬆️

... and 6 files with indirect coverage changes