feat: add gpu example

[vburckhardt]

Description

fixes #836

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Release notes content

This pull request adds a new GPU worker pool example for deploying OpenShift clusters on IBM Cloud VPC. The example demonstrates how to create a cluster with both general-purpose and GPU-enabled nodes, and includes supporting Terraform configuration, documentation, and automated test coverage.

New GPU worker pool example:

• Added a new documented example in examples/gpu for provisioning an OpenShift cluster with a default worker pool and a GPU worker pool, including configuration for VPC, subnets, resource group, and worker pools.

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Checklist for reviewers

• If relevant, a test for the change is included or updated with this PR.
• If relevant, documentation for the change is included or updated with this PR.

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[vburckhardt]

/run pipeline

[vburckhardt]

Error: CreateFlowLogCollectorWithContext failed: Your Cloud Object Storage (COS)
bucket is missing the Identity Authorization Management (IAM) authorization to allow
the flow logs service to write flow logs to your bucket. (Error response code returned
from COS Config call: 403)
``` in tests.

[vburckhardt]

/run pipeline

[ocofaigh]

This file is not needed since we no longer onboard to module registry

[ocofaigh]

A fix was added in #840 for the validation error so this should get past that issue on next pipeline run