Experiment with removing the "Warm" workload

Container apps believes it shouldnt be necessary to have the workload in container-apps-environment.bicep:

```

- {
- name: 'Warm'
- workloadProfileType: 'D4'
- minimumCount: 1
- maximumCount: 3
- }
-
```

Start with container-apps-environment.bicep and review the existing Warm workload block. Experiment with removing that block, then verify whether the container apps environment still behaves as expected; done means the result of the experiment is clear and the configuration change is recorded.

Written by the indexing model from the issue text.