Change GCP Technology preview to Generally available

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux_ai/1.3/html/release_notes/rhelai_release_notes#installation-feature-tracker

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux_ai/1.3/html/release_notes/rhelai_release_notes#red-hat-enterprise-linux-ai-feature-tracker

To Reproduce Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

• <your text here>

Screenshots

• Attached Image 

Device Info (please complete the following information):

• Hardware Specs: [e.g. Apple M2 Pro Chip, 16 GB Memory, etc.]
• OS Version: [e.g. Mac OS 14.4.1, Fedora Linux 40]
• Python Version: [output of \\\{{{}python --version{}}}]
• InstructLab Version: [output of \\\{{{}ilab --version{}}}]

Additional context

• <your text here>
• …