Fix resource manifest modal loading state

[anonymusk7]

Summary

• add a loading state for resource manifest fetches
• render resource manifests with the same Ace-based layout/options used by the module/rendered manifest modals
• remove the resource manifest modal OK footer so it closes via the modal close/cancel affordance

Closes #641.

Validation

• npx --yes prettier@3.2.5 --check cyclops-ui/src/components/k8s-resources/ResourceList/ResourceList.tsx
• git diff --check

Note

I attempted yarn --cwd cyclops-ui install --frozen-lockfile --ignore-scripts twice, including with --network-timeout 600000, but dependency fetching stalled in this environment before node_modules was created. I did not claim a full local build.

[anonymusk7]

@quest-bot loot #641