chore: Introducing ReactorDebugAgent to improve the stack traces and make them easier to debug (#34485)

## Description
This is a chore PR to improve the stack traces printed by Webflux. 

After:
<img width="1423" alt="Screenshot 2024-06-26 at 1 59 12 PM"
src="https://github.com/appsmithorg/appsmith/assets/458946/a89f2cf5-db7d-4430-b248-bee5fc26a218">

Before:
<img width="1449" alt="Screenshot 2024-06-26 at 1 59 43 PM"
src="https://github.com/appsmithorg/appsmith/assets/458946/0f794db2-d40d-4d4f-b79f-c40b126222f0">

> [!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="@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/9676222187>
> Commit: 6769b2360448c4bbc61280f5629f7a93ea55dfa0
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9676222187&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`

<!-- 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

- **Refactor**
  - Upgraded internal dependencies for improved debugging and testing.

- **Chores**
- Enhanced stack trace debugging by initializing the Reactor Debug
Agent.


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

app/server/appsmith-server/pom.xml

@@ -438,6 +438,14 @@
             <version>2.14.2.Final</version>
             <scope>test</scope>
         </dependency>
+
+        <!-- This dependency helps us print better & debuggable stack traces -->
+        <dependency>
+            <groupId>io.projectreactor</groupId>
+            <artifactId>reactor-tools</artifactId>
+            <version>${reactor-test.version}</version>
+        </dependency>
+
     </dependencies>
 
     <repositories>

app/server/appsmith-server/src/main/java/com/appsmith/server/ServerApplication.java

@@ -26,6 +26,7 @@ import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.scheduling.annotation.EnableScheduling;
+import reactor.tools.agent.ReactorDebugAgent;
 
 import java.time.Duration;
 
@@ -55,6 +56,7 @@ public class ServerApplication {
     }
 
     public static void main(String[] args) {
+        ReactorDebugAgent.init();
         new SpringApplicationBuilder(ServerApplication.class)
                 .bannerMode(Banner.Mode.OFF)
                 .run(args);

app/server/pom.xml

@@ -41,7 +41,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.groupId>com.appsmith</project.groupId>
         <project.version>1.0-SNAPSHOT</project.version>
-        <reactor-test.version>3.5.1</reactor-test.version>
+        <reactor-test.version>3.6.7</reactor-test.version>
         <!-- By default skip the dockerization step. Only activate if necessary -->
         <skipDockerBuild>true</skipDockerBuild>
         <!-- We're forcing this version temporarily to fix CVE-2022-1471-->