[Core feature] Surface pod template mis-configuration in the UI.

[thomasjpfan]

Motivation: Why do you think this is important?

When working with PodTemplates any misconfiguration do not show up in the UI. The UI only shows "pending". The only way to debug it is to see the propeller logs.

Goal: What should the final outcome look like, ideally?

The errors related to pod template misconfiguration are show in the UI.

Describe alternatives you've considered

We can also do the same type of validation on the client side so we error early.

Propose: Link/Inline OR Additional context

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[eapolinario]

Let's investigate two (complementary) approaches:

1. validate podspec at registration time in flytekit
2. Use https://pkg.go.dev/k8s.io/kubernetes/pkg/apis/core/validation to validate podspecs in flyteadmin

[kevinliao852]

#take