feat: adds mini preview on each deploy

[tnolet]

trafficstars

I hereby confirm that I followed the code guidelines found at engineering guidelines

Affected Components

• [x] CLI
• [ ] Create CLI
• [ ] Test
• [ ] Docs
• [ ] Examples
• [ ] Other

Notes for the Reviewer

• Adds a small, extra preview to each deploy command.
• Refactors the preview fetching to a dedicated method and adds a type. Adds a counter and aligns indentation.
• Reshuffles some copy and format on the full --preview command

Examples

Mini preview example

timnolet@MacBook-Pro-van-Tim beige-gazelle % npx checkly deploy          
Parsing your project... done

Deploy preview:

 - 1 to create, 0 to delete

 For a full preview, run: npx checkly deploy --preview

? You are about to deploy your project "Acme webapp" to account "Acme Production". Do you want to continue? › (y/N)

Full preview example:

timnolet@MacBook-Pro-van-Tim beige-gazelle % npx checkly deploy --preview
Parsing your project... done
Creating (1):
 ApiCheck: checkly-api-123

Updating or leaving unchanged (4):
 BrowserCheck: __checks__/docs.spec.ts
 ApiCheck: checkly-api-1
 ApiCheck: checkly-api-2
 BrowserCheck: checkly-homepage

Skipping because of testOnly (1):
 ApiCheck: checkly-api-12