chore: Slight clean up to avoid EE start up errors (#39585)

## Description
> [!TIP]  
> _Add a TL;DR when the description is longer than 500 words or
extremely technical (helps the content, marketing, and DevRel team)._
>
> _Please also include relevant motivation and context. List any
dependencies that are required for this change. Add links to Notion,
Figma or any other documents that might be relevant to the PR._


Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
> [!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=""

### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!CAUTION]  
> If you modify the content in this section, you are likely to disrupt
the CI result for your PR.

<!-- end of auto-generated comment: Cypress test results  -->


## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Chores**
- Streamlined internal server configuration for improved
maintainability, ensuring a robust foundation for future enhancements
without affecting current functionality.

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

app/server/appsmith-server/src/main/java/com/appsmith/server/configurations/ReactorNettyConfiguration.java

@@ -11,8 +11,6 @@ import java.util.function.Function;
 @Component
 public class ReactorNettyConfiguration implements WebServerFactoryCustomizer<NettyReactiveWebServerFactory> {
 
-    private final CommonConfig commonConfig;
-
     @Override
     public void customize(NettyReactiveWebServerFactory factory) {
         factory.addServerCustomizers(httpServer -> httpServer.metrics(true, Function.identity()));