## What does this PR do?
Follow-up to #27085 and #27092 - creates the database migration to drop the deprecated `startTime` and `endTime` columns from the `users` table.
These columns were marked as `// DEPRECATED - TO BE REMOVED` in the Prisma schema. The prerequisite PRs removed all code references to these columns, making it safe to now drop them from the database.
**Changes:**
- Remove `startTime` and `endTime` fields from the `User` model in `schema.prisma`
- Add migration to drop both columns from the `users` table
- Remove `startTime` and `endTime` from test builder (`packages/lib/test/builder.ts`)
## Mandatory Tasks (DO NOT REMOVE)
- [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
- [x] I have updated the developer docs in /docs if this PR makes changes that would require a [documentation change](https://cal.com/docs). N/A - internal schema cleanup
- [x] I confirm automated tests are in place that prove my fix is effective or that my feature works. N/A - schema migration only, existing tests should continue to pass
## How should this be tested?
1. Verify PRs #27085 and #27092 have been merged (prerequisite)
2. Run `yarn prisma generate` - should complete without errors
3. Run `yarn type-check:ci --force` - should pass (no code references these columns anymore)
4. Apply migration to a test database and verify columns are dropped
## Checklist
- [x] My code follows the style guidelines of this project
- [x] I have checked if my changes generate no new warnings
## Human Review Checklist
- [ ] Confirm PRs #27085 and #27092 are merged before merging this PR
- [ ] Verify no remaining code references to `user.startTime` or `user.endTime` in the codebase
- [ ] ⚠️ **Breaking change**: This permanently drops data from the `users` table. Ensure no external systems depend on these columns.
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Link to Devin run: https://app.devin.ai/sessions/c5a10684d905496fbce66a0b464a73a5
Requested by: @emrysal
