## Summary
- Fixed a bug where `Raw()` with `Where()` and
`Count()`/`ScanAndCount()` was ignoring the Where conditions in Count
queries
- The issue was in `getFormattedSqlAndArgs()` which returned `nil` for
`conditionArgs` without calling `formatCondition()` for Raw SQL in
`SelectTypeCount` case
## Changes
- Modified `database/gdb/gdb_model_select.go` to call
`formatCondition()` for Raw SQL Count queries
- Added comprehensive test cases for MySQL and PostgreSQL drivers
- Fixed incorrect test expectation in `Test_Model_Raw`
## Test plan
- [x] Added `Test_Issue4500` with 6 edge cases covering:
- Raw SQL with WHERE + external Where condition
- Raw SQL without WHERE + external Where condition
- Raw + Where + ScanAndCount
- Raw + multiple Where conditions
- Raw SQL with no external Where (baseline)
- Verify All() still works correctly
- [x] All tests pass on PostgreSQL
Closes#4500
