chore: add code-split for fixing package version change bug with in-memory Git (#41442)

## Description

EE Counterpart: appsmithorg/appsmith-ee#8468

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.Git"

### 🔍 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/19896141793>
> Commit: 478fefe
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=19896141793&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Git`
> Spec:
> <hr>Wed, 03 Dec 2025 14:41:38 UTC
<!-- end of auto-generated comment: Cypress test results  -->


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


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

* **Bug Fixes**
* Improved error reporting for missing Git-related resources by
including contextual details.

* **Refactor**
* Reorganized Git routing internals into a new layered implementation to
simplify flow and improve reliability.

* **Tests**
* Updated tests to align with the restructured Git routing
implementation.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: subrata71

app/server/appsmith-server/src/main/java/com/appsmith/server/artifacts/gitRoute/GitRouteArtifactCE.java

@@ -25,7 +25,8 @@ public Mono<Artifact> getArtifact(ArtifactType artifactType, String artifactId)
         return switch (artifactType) {
             case APPLICATION -> applicationRepository
                     .findById(artifactId)
-                    .switchIfEmpty(Mono.error(new AppsmithException(AppsmithError.NO_RESOURCE_FOUND)))
+                    .switchIfEmpty(Mono.error(
+                            new AppsmithException(AppsmithError.NO_RESOURCE_FOUND, artifactType, artifactId)))
                     .map(app -> (Artifact) app);
             default -> Mono.error(new AppsmithException(AppsmithError.GIT_ROUTE_HANDLER_NOT_FOUND, artifactType));
         };