fix: updating genai tests to run on same gcp project as ai platform samples

[pattishin]

Description

Replaces which GCP projects tests will get run for genai samples.

Checklist

• [x] I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• [ ] Tests pass: npm test (see Testing)
• [x] Lint pass: npm run lint (see Style)
• [x] 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)
• [x] This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new sample directory, and I created GitHub Actions workflow 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
• [x] Please merge this PR for me once it is approved