feat: New Compute Sample - Consume single project reservation

[Thoughtseize1]

Description

🔶 Created new Compute Sample for Consume a specific single-project reservation. Doc.page

Region tag	Filename
compute_consume_single_project_reservation	/compute_reservations/consume_single_project_reservation.py

👀 Refactored compute_reservation/create_compute_reservation.py -> deleted specific_reservation_required parameter to implement it in new created file.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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 sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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 1 region tag.

• compute/client_library/snippets/compute_reservations/consume_single_project_reservation.py:21, tag compute_consume_single_project_reservation

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