Add simple terraform pipeline eval

[kmontg]

This adds a simple eval for testing the pipeline design skill when the user asks for Terraform and Cloud Deploy to be used.

Static assertions check for a cloudbuild.yaml file with test, build, push and deploy steps and a check that the created terraform is valid, and contains resources that are expected for this type of deployment. We may want to improve these checks in the future.

Note that this eval is quite flaky, as often the expected skills are not triggered. We can use this to drive improvements to the skill definitions so that they are applied more consistently.

[gemini-code-assist]

Code Review

This pull request introduces dynamic resource naming for evaluation tasks, updates cleanup and validation scripts to handle these names as arguments, and adds a new evaluation task for designing CI/CD pipelines using Terraform. Feedback highlights potential issues in the new validation scripts, specifically regarding the fragility of using grep for YAML and Terraform plan analysis, the lack of variable handling in Terraform validation, and the removal of explicit project flags in GCS cleanup which could lead to environment-dependent failures.