Server UI shows error loading cluster summary when any of the pipeline is invalid

[KeranYang]

Describe the bug

To Reproduce Steps to reproduce the behaviour:

1. IMPORTANT: choose a non-prod cluster which has minimal numaflow users. This is to ensure we don't block others from browsing the UI.
2. Create a pipeline with a valid generator source {... duration: "3s"}
3. Go to ArgoCD and manually update the pipeline spec to duration: "3"}, making the spec invalid.
4. Sync the pipeline and refresh the UI, the UI should fail with the error above.

The root cause is that, as quoted from Derek:

we do not use full CRD spec.

Expected behavior

An individual invalid pipeline shouldn't block the entire server UI.

Environment (please complete the following information):

• Numaflow: v1.2.1

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