refactor: refactor parental control use case classes

This commit includes the following changes:
- Renamed GetParentalControlStateUseCaseImpl.kt to GetParentalControlStateUseCase.kt, and updated its usage in other classes.
- Updated import statements in GetAppInstallationPermissionUseCaseTest.kt and GetAppInstallationPermissionUseCase.kt to reflect the new class name.
- Removed an unused import from GetAppInstallationPermissionUseCase.kt.