[CI Failure] Flaky: MongoDbReplicaSetFunctionalTests.VerifyMongoDBMultiNodeReplicaSetAllNodesEndUpHealthy fails to become healthy

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/34240077767
Build error leg or test failing: Tests / No-package tests (regular, Aspire.Hosting.MongoDB.Tests, Hosting.MongoDB, Hosting.MongoDB, tests/... / Hosting.MongoDB (ubuntu-latest) / `Aspire.Hosting.MongoDB.Tests.MongoDbReplicaSetFunctionalTests.VerifyMongoDBMultiNodeReplicaSetAllNodesEndUpHealthy`
Pull request: #19383

## Error Message

```
Aspire.Hosting.DistributedApplicationException : Stopped waiting for resource 'rs0' to become healthy because it failed to start.
at Aspire.Hosting.ApplicationModel.ResourceNotificationService.WaitForResourceHealthyAsync(String resourceName, WaitBehavior waitBehavior, CancellationToken cancellationToken)
```

## Description

Flaky: MongoDbReplicaSetFunctionalTests.VerifyMongoDBMultiNodeReplicaSetAllNodesEndUpHealthy fails to become healthy

**Type**: flaky-test

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-09-08 | [34240077767](https://github.com/microsoft/aspire/actions/runs/34240077767) | Tests / No-package tests (regular, Aspire.Hosting.MongoDB.Tests, Hosting.MongoDB, Hosting.MongoDB, tests/... / Hosting.MongoDB (ubuntu-latest) | #19383 |

Start by running Aspire.Hosting.MongoDB.Tests.MongoDbReplicaSetFunctionalTests.VerifyMongoDBMultiNodeReplicaSetAllNodesEndUpHealthy in the Hosting.MongoDB test project and review its replica-set setup and health wait. Investigate why resource 'rs0' can fail to become healthy on ubuntu-latest. Done means the test reliably reaches a healthy multi-node MongoDB replica set without reproducing the reported failure.

Written by the indexing model from the issue text.