Description of problem:

i'm trying to use the operator to spawn DH instance on a ROSA 4.15 cluster. The UI pod does not start and I see the following issue in `Events` : `0/2 nodes are available: 2 Insufficient cpu. preemption: 0/2 nodes are available: 2 No preemption victims found for incoming pod..`. I looked at the Deployment, and see that while the containers have limits, they do not have requests.

The cluster has 8 CPU. I install the gitops and pipeline operators. The overview reports about 6.7 of available CPU.

I install the developer-hub operator and create a backstage instance. There's still more than 6 CPU available reported in the Overview console page. Yet the pod isn't scheduled.

Adding the following `requests` field to the `deployment.yaml` of `backstage-default-config` for both containers fixes the issue.
```
requests:
cpu: 125m
memory: 128Mi
```

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Get a ROSA cluster via clusterbot
2. install the GitOps and Pipelines operators
3. Install the Developer Hub operator
4. Create a new backstage instace

Actual results:

1. UI pod is created but is not scheduled, stays in `Pending` status.

Expected results:

1. UI pod is in `Running` status.

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

Additional info (Such as Logs, Screenshots, etc):

Slack thread