## Description
Building blocks onboarding banner was showing to users while in preview
mode. This PR checks for isPreviewMode and sets the building blocks
onboarding to hide when in preview mode.
Fixes#33954
## Automation
/ok-to-test tags="@tag.Sanity"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9364855811>
> Commit: e7c0ee51484adbe1e73d3941dc7e99469ae7fdc3
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9364855811&attempt=1"
target="_blank">Click here!</a>
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [x] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Onboarding component now respects the preview mode setting, ensuring
it does not render when in preview mode.
- **Tests**
- Added test cases to verify that the onboarding component does not
render in preview mode for both "Non-AirGap Edition" and "AirGap
Edition".
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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