* remove billing service factory
* remove index file
* update internal team billing
* update test
* fix unit test
* fix: update internal-team-billing tests to use direct StripeBillingService mocking
- Changed mock path from @calcom/features/ee/billing/stripe-billing-service to ../stripe-billing-service to match actual import
- Used vi.hoisted() to ensure mock functions are available in hoisted mock factory context
- Changed vi.resetAllMocks() to vi.clearAllMocks() and re-apply mock implementation in beforeEach to preserve constructor mock
- Removed obsolete vi.mock("..") for deleted billing singleton module
- Fixed test pollution by creating new instances instead of mutating shared state
- Removed describe-level instance creation that was executed before mocks were set up
- All 12 tests now pass successfully
Co-Authored-By: benny@cal.com <sldisek783@gmail.com>
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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>