Removed feature flag related code to consolidated api, also corrections
in feature flags are made here.
Fixes#31100
## Automation
/ok-to-test tags="@tag.All"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> Tests running at:
<https://github.com/appsmithorg/appsmith/actions/runs/8490467344>
> Commit: `fce48b210983689994152b7ae77c773cfdca854a`
> Workflow: `PR Automation test suite`
> Tags: ``
<!-- end of auto-generated comment: Cypress test results -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced new feature flags to enhance user interface and default
settings.
- **Refactor**
- Simplified page loading logic for better performance.
- Enhanced error handling and reporting for a smoother user experience.
- **Chores**
- Cleaned up unused imports and code for better maintainability.
- **Bug Fixes**
- Removed redundant checks and updated functionality to include new
feature flags.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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