Deployment E2E: AcaManagedRedisDeploymentTests fails due to Container App Environment quota limit

## Summary

The \AcaManagedRedisDeploymentTests.DeployStarterWithManagedRedisToAzureContainerApps\ deployment E2E test fails because the deployment test subscription has exceeded the Container App Environment limit in East US.

## Error

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Failed to provision infra: Deployment failed: Error code = MaxNumberOfRegionalEnvironmentsInSubExceeded,
Message = The subscription 'e7db39f0-...' cannot have more than 1 Container App Environments in East US.
For more information, visit: https://go.microsoft.com/fwlink/?linkid=2208872
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## Action Required

Request increased Container App Environment quota in East US for the deployment E2E test subscription, or switch this test to use a region with available capacity (e.g. westus3).

## Context

- Seen in PR #16298 deployment test run [24653523089](https://github.com/microsoft/aspire/actions/runs/24653523089)
- The test currently uses \astus\ (required for Azure Managed Redis availability zone support)