Set allowedOrigins in RedpandaCloud as list of strings

[pvsune]

Cover letter

RedpandaCloud AllowedOrigins should be a list of strings, putting a CSV is only supported for environment variables.

Fixes https://github.com/redpanda-data/cloudv2/issues/2354
Slack discussion

Backport Required

• not a bug fix
• issue does not exist in previous branches
• papercut/not impactful enough to backport
• v22.2.x
• v22.1.x
• v21.11.x

UX changes

AllowedOrigins can be set as a list:

apiVersion: redpanda.vectorized.io/v1alpha1
kind: Console
metadata:
  name: test-console
  namespace: default
spec:
  clusterRef:
    name: rp-a029c4a
    namespace: rp-2-471-3743
  login:
    enabled: true
    redpandaCoud:
      enabled: true
      domain: vectorized-dev.us.auth0.com
      audience: dev.vectorized.cloud
      allowedOrigins:
      - http://localhost:3000
      - https://dev--redpanda-cloud.netlify.app/
  ...

Release notes

Improvements

• RedpandaCloud AllowedOrigins can be set as a list