Show envFrom in UI container information, matching env behavior

[inigohidalgo]

Summary

Currently, if an environment variable is specified using

env:
  - name: VAR_NAME
    value: dev

it is shown in the web UI like so

On the other hand, when populating environment variables using

envFrom:
          - configMapRef:
              name: {{ include "components.usecase_configmap" . }}

          - secretRef:
              name: {{ include "components.usecase_secrets" . }}

This is not reflected in the UI anywhere that I can see.

Use Cases

When would you use this?

It is helpful to have this visibility on which configMaps or secretRefs are being inserted into a container's environment, it would have saved me some unnecessary debugging last week #3310 (comment)

The asymmetry in ENV being shown but not showing anything for envFrom is what led me to this confusion. If neither had been shown in the UI I would've found the issue faster.

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