Failing test: Aspire.Hosting.Azure.Tests.AzureDeployerTests.DeployAsync_WithSingleRedisCache_CallsDeployingComputeResources

## Build Information
Build: https://github.com/dotnet/aspire/actions/runs/18927391540
Build error leg or test failing: Aspire.Hosting.Azure.Tests.AzureDeployerTests.DeployAsync_WithSingleRedisCache_CallsDeployingComputeResources
Pull request:

## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Projects/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": "",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

## Error Details

```
Assert.Contains() Failure: Item not found in collection
Collection: ["pipeline execution", "deploy-prereq", "validate-azure-login", "create-provisioning-context", "provision-env", ···]
Not found: "provision-cache-containerapp"
```

Stack Trace

```
at Aspire.Hosting.Azure.Tests.AzureDeployerTests.DeployAsync_WithSingleRedisCache_CallsDeployingComputeResources() in D:\a\aspire\aspire\tests\Aspire.Hosting.Azure.Tests\AzureDeployerTests.cs:line 638
--- End of stack trace from previous location ---
```

📊 **[View CI Failure Report](https://github.com/microsoft/aspire/issues/12512#issuecomment-4174838945)**

Start with tests/Aspire.Hosting.Azure.Tests/AzureDeployerTests.cs at line 638 and review the failing DeployAsync_WithSingleRedisCache_CallsDeployingComputeResources test. Run the referenced build or the test project to reproduce the missing "provision-cache-containerapp" item, then compare the expected deployment pipeline with the generated collection. Done means the test passes with the intended Redis cache deployment steps present.

Written by the indexing model from the issue text.