chore: Replace prisma actions Credential Repository / SelectedCalendar Repository methods

[hbjORbj]

What does this PR do?

• A refactor to not use prisma in api/integrations/googlecalendar/callback
• Create a dedicated google.ts file in packages/lib and move google related methods there
• This will come handy for feat: New onboarding flow #17251

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• N/A - I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (11/02/24)

1 reviewer was added to this PR based on Keith Williams's automation.

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[github-actions]

E2E results are ready!

• Workflow #36819.1 latest results

[keithwillcode]

@hbjORbj sone unit tests are failing

[joeauyeung]

This is on the right track @hbjORbj.

I noticed there are "Google" specific methods in the repositories. I think these repositories should be agnostic of any app they're interacting with, or else we would end up with a ton of methods for each specific app.

If you want to create any reusable functions for GCal I think it should live in the gcal folder. There we can call on the repository methods.

[CLAassistant]

All committers have signed the CLA.

[hbjORbj]

@joeauyeung Thanks for the review. Good point, I made GoogleRepository.

[joeauyeung]

I'll approve for now as the functionality works.

I'm a uneasy with the idea of having google specific functions living mixing with files that handle core logic. I think once we start working on #17251 there might be a better place to keep these files.

[hbjORbj]

Thanks Joe. Joe and I agreed that we rename GoogleRepository to GoogleService and move it to /services folder to not mix concepts! (Will be included in #17251)