Onboarding: Revert Google enum fix

[Prajna1999]

Is your feature request related to a problem?
New onboarding is failing due to the Google enum expecting Google GCP credentials instead of the correct ones.

Describe the solution you'd like

• Revert Google enum back to Google AI Studio route
• This is a hotfix; ensure to merge with main

Original issue

Describe the bug
New onborading was failing because google enum was expecting Google GCP credentials.

Expected behavior
Revert google enum back to google_aistudio route

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
This is a hotfix. Make sure to merge with main