fix: print instructions even if installPackages fails

[rozenmd]

Before:

 ⛅️ wrangler 0.0.0-3c7a216
---------------------------------------------------------------------
Using npm as package manager.
✨ Created quick-wins-init-1-1/wrangler.toml
Would you like to use git to manage this Worker? (y/n)
✨ Initialized git repository at quick-wins-init-1-1
No package.json found. Would you like to create one? (y/n)
✨ Created quick-wins-init-1-1/package.json
Would you like to use TypeScript? (y/n)
✨ Created quick-wins-init-1-1/tsconfig.json
Would you like to create a Worker at quick-wins-init-1-1/src/index.ts? (y/n)
✨ Created quick-wins-init-1-1/src/index.ts
npm ERR! code ETARGET
npm ERR! notarget No matching version found for wrangler@0.0.0-3c7a216.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/rozenmd/.npm/_logs/2022-05-25T15_44_20_140Z-debug-0.log

✘ [ERROR] Command failed with exit code 1: npm install @cloudflare/workers-types typescript --save-dev


If you think this is a bug then please create an issue at https://github.com/cloudflare/wrangler2/issues/new.

After:

 ⛅️ wrangler 0.0.0-a6430c0
---------------------------
Using npm as package manager.
✨ Created quick-wins-init5/wrangler.toml
Would you like to use git to manage this Worker? (y/n)
✨ Initialized git repository at quick-wins-init5
No package.json found. Would you like to create one? (y/n)
✨ Created quick-wins-init5/package.json
Would you like to use TypeScript? (y/n)
✨ Created quick-wins-init5/tsconfig.json
Would you like to create a Worker at quick-wins-init5/src/index.ts? (y/n)
✨ Created quick-wins-init5/src/index.ts
npm ERR! code ETARGET
npm ERR! notarget No matching version found for wrangler@0.0.0-a6430c0.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/rozenmd/.npm/_logs/2022-05-25T15_42_38_809Z-debug-0.log
✘ [ERROR] Command failed with exit code 1: npm install @cloudflare/workers-types typescript --save-dev



To start developing your Worker, run `cd quick-wins-init5 && npm start`
To publish your Worker to the Internet, run `npm run publish`

🚨 wrangler was unable to fetch your npm packages, but your project is ready to go

Closes #1109

[changeset-bot]

🦋 Changeset detected

Latest commit: c0d6f1a

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

Not sure what this means? Click here to learn what changesets are.

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.developers.workers.dev/runs/2385532490/npm-package-wrangler-1110

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

npm install --save-dev https://prerelease-registry.developers.workers.dev/prs/1110/npm-package-wrangler-1110

Or you can use npx with this latest build directly:

npx https://prerelease-registry.developers.workers.dev/runs/2385532490/npm-package-wrangler-1110 dev path/to/script.js

[petebacondarwin]

Nice addition. Could we avoid displaying the npm ERR lines?
Happy to land this as-is and iterate, since it is an improvement on what we had before.