fix: remove extra nfs field in persistentVolume object (#41724)

## Description

Removes extra `nfs:` field in the persistentVolume object when EFS
enabled.

Older Helm versions seem to have just ignored this, but latest Helm does
not.

Fixes [Issue URL](https://github.com/appsmithorg/appsmith/issues/40461)
> [!WARNING]  
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._

## Automation

/ok-to-test tags=""

### :mag: Cypress test results
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## 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

* **Chores**
  * Updated Helm chart version to 3.6.10
* Modified persistent volume configuration for EFS-backed storage
deployments

<!-- end of auto-generated comment: release notes by coderabbit.ai -->