Update Pydantic schemas based on latest API specification

[nifadyev]

What's wrong

Toggl updated its API and made some fields unavailable. It leads to errors because these fields marked as mandatory.

Fields to remove:

• Project.template
• WorkspaceResponseBase.only_admins_see_billable_rates

How it should work?

API responses should be handled without errors.

Checklist before calling for maintainers

• Have you checked to ensure there aren't other open Issues for the same problem?