## Description
PR to add the necessary grants to `appsmith` user when user opts for Postgres embedded DB.
fixes https://github.com/appsmithorg/appsmith/issues/36661
## Automation
/test 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/11155064003>
> Commit: 1fb82e52a3f05da1b9bb4082cf871a62d3554d78
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=11155064003&attempt=2"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`
> Spec:
> <hr>Thu, 03 Oct 2024 04:22:54 UTC
<!-- 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**
- Introduced default values for PostgreSQL database connection
parameters.
- Added a new function to manage user permissions on database schemas.
- **Improvements**
- Enhanced the existing database initialization process to include
permission granting after schema verification.
- Updated documentation within the script for better clarity on new
functionalities.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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