feat: add compute_reservations_delete/get/list

[gryczj]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• compute/reservations/deleteReservation.js:18, tag compute_reservation_delete
• compute/reservations/getReservation.js:20, tag compute_reservation_get
• compute/reservations/getReservations.js:20, tag compute_reservation_list

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[subfuzion]

Great PR; the only real nit I have is using chai just to make an expect call. This can easily be handled without an extra package dependency (I realize the package dependency was already there for other tests, but String.prototype.includes() would do what you need here). Ideally, we'd have fewer test dependencies and rely more on core APIs, a goal I think we'll articulate more. That being said, maybe keep it in mind for future refactoring and let's get your queue merged! :)