chore: use spybean for SessionUserService and remove unused method for populating the userId in the ActionExecuteDTO (#37268)

## Description
> Fix test case for EE


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="@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/11717655239>
> Commit: 87131cbe02fa4e13ef4a88288ffa64a27846c9fc
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=11717655239&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`
> Spec:
> <hr>Thu, 07 Nov 2024 06:49:49 UTC
<!-- 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

## Summary by CodeRabbit

- **Tests**
- Updated the `sessionUserService` field in the test class to utilize
partial mocking, enhancing the verification of interactions during
tests.
- **Bug Fixes**
- Removed the method responsible for populating user IDs in action
execution, streamlining user identification handling.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Nilesh Sarupriya <20905988+nsarupr@users.noreply.github.com>

app/server/appsmith-server/src/main/java/com/appsmith/server/solutions/ce/ActionExecutionSolutionCEImpl.java

@@ -265,15 +265,6 @@ public class ActionExecutionSolutionCEImpl implements ActionExecutionSolutionCE
                         }));
     }
 
-    /**
-     * Populates the requestParams with logged in userId.
-     * If the user is not logged in, set the parameter as anonymousUserId
-     *
-     */
-    protected Mono<ExecuteActionDTO> populateExecuteActionDTOWithUserId(ExecuteActionDTO executeActionDTO) {
-        return Mono.just(executeActionDTO);
-    }
-
     /**
      * Executes the action(queries) by creating executeActionDTO and sending it to the plugin for further execution
      *

app/server/appsmith-server/src/test/java/com/appsmith/server/solutions/ce/ActionExecutionSolutionCEImplTest.java

@@ -109,7 +109,7 @@ class ActionExecutionSolutionCEImplTest {
     @MockBean
     ApplicationService applicationService;
 
-    @MockBean
+    @SpyBean
     SessionUserService sessionUserService;
 
     @MockBean