feat(GKE): add reservation samples

[apeabody]

Description

add GKE reservation samples

Checklist

Readiness

• [x] Yes, merge this PR after it is approved
• [ ] No, don't merge this PR after it is approved

Style

• [x] My sample follows the rules described for Terraform in the Effective Samples style guide
• [x] My sample follows the other requirements and best practices in the Contributing guide

Testing

• [x] I have performed tests described in the Contributing guide:

  • [x] Tests pass: terraform apply
  • [x] Lint pass: terraform fmt check

Intended location

• [x] Yes, this sample will be (or already is) included on cloud.google.com Location(s): https://cloud.google.com/kubernetes-engine/docs/how-to/consuming-reservations

• [ ] No, this sample won't be included on cloud.google.com Reason:

API enablement

• [x] If the sample needs an API enabled to pass testing, I have added the service to the Test setup file

Review

• [x] If this sample adds a new directory, I have added codeowners to the CODEOWNERS file

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 9 region tags.

- [gke/autopilot/reservation/main.tf:30](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/autopilot/reservation/main.tf#L30), tag `gke_autopilot_reservation_specific_reservation` - [gke/autopilot/reservation/main.tf:52](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/autopilot/reservation/main.tf#L52), tag `gke_autopilot_reservation_specific_cluster` - [gke/autopilot/reservation/main.tf:86](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/autopilot/reservation/main.tf#L86), tag `gke_autopilot_reservation_specific_pod` - [gke/autopilot/reservation/main.tf:139](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/autopilot/reservation/main.tf#L139), tag `gke_autopilot_reservation_specific_accelerator` - [gke/standard/zonal/reservation/main.tf:17](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/standard/zonal/reservation/main.tf#L17), tag `gke_standard_zonal_reservation_any_reservation` - [gke/standard/zonal/reservation/main.tf:32](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/standard/zonal/reservation/main.tf#L32), tag `gke_standard_zonal_reservation_any_cluster` - [gke/standard/zonal/reservation/main.tf:57](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/standard/zonal/reservation/main.tf#L57), tag `gke_standard_zonal_reservation_any_node_pool` - [gke/standard/zonal/reservation/main.tf:74](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/standard/zonal/reservation/main.tf#L74), tag `gke_standard_zonal_reservation_specific_reservation` - [gke/standard/zonal/reservation/main.tf:91](https://github.com/terraform-google-modules/terraform-docs-samples/blob/7eb813875a69f3a72aa0154c4929d50029583cd3/gke/standard/zonal/reservation/main.tf#L91), tag `gke_standard_zonal_reservation_specific_node_pool`

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[glasnt]

Unrelated CI failure. Will try re-running.

[glasnt]

/gcbrun

[apeabody]

(re-triggered from another flake)

[apeabody]

The repeated CI failure is from an unrelated GKE sample. Moved my experiment on finer test filtering to https://github.com/terraform-google-modules/terraform-docs-samples/pull/669