Fix reservation block usage in gke-node-pool module and add integration test

[SwarnaBharathiMantena]

Using a specific reservation block to create a GKE nodepool resulted in a deployment failure.
Fixed it by updating the logic.
Also, added an integration test so that this feature is ensured to be working with future changes.

Error:

Error: error creating NodePool: googleapi: Error 404: Google Compute
  Engine: reservation "h4d-reservation/reservationBlocks/h4d-reservation-block-0001"
  not found for node pool "h4d-highmem-192-lssd-h4d-pool" at zone "us-central1-b".

[gemini-code-assist]

Summary of Changes

Hello @SwarnaBharathiMantena, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a critical issue preventing GKE node pool deployments from successfully utilizing specific reservation blocks, which was caused by an incorrect format in the reservation name construction. The core change involves refining the Terraform logic to ensure accurate referencing of reservations. To bolster the reliability of this functionality, a new integration test has been added to the daily test suite, providing continuous validation for GKE node pool reservation capabilities.

Highlights

• GKE Node Pool Reservation Fix: Corrected the logic for constructing GKE node pool reservation names in reservation_definitions.tf. The previous implementation could lead to "reservation not found" errors by incorrectly formatting the reservation path. The fix ensures that reservation names are consistently formatted as projects/{project}/reservations/{name}.
• New Integration Test for Reservations: Introduced a new daily integration test suite, including gke-reservation-block.yaml and gke-reservation-block.yml, to validate the correct usage and functionality of GKE node pool reservation blocks. This test will help prevent regressions and ensure the stability of reservation-based GKE deployments.

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[gemini-code-assist]

Code Review

This pull request addresses a bug that caused deployment failures when using a specific reservation block with a GKE node pool. The fix correctly modifies the reservation value passed to the API. Additionally, a new integration test is introduced to validate this fix. My review identified a couple of issues within the new test configuration that would prevent it from running as intended. I've provided specific suggestions to correct the test setup, ensuring the fix is properly validated.