[Improvement]: Accept the Moesif collector key as a Secret reference in Helm chart

[Milanka00]

Please select the area the issue is related to

Gateway

Please select the aspect the issue is related to

Aspect/Configuration (Config files, settings, env vars, defaults)

Suggested Improvement

The Moesif collector key in the Gateway Helm chart is currently configured as a plaintext Helm value:

deployment:
  enabled: true
  replicaCount: 1
  env:
    gatewayControllerHost: ""
    logLevel: info
    moesifKey: ""

Since the Moesif collector key is sensitive, it should be referenced from a Kubernetes Secret instead of being provided directly as a Helm value.

Expected change

Support a Secret reference, for example:

deployment:
  env:
    moesifKeySecretRef:
      name: ""
      key: moesif-key

The Gateway should then read the Moesif collector key from the referenced Kubernetes Secret.

Related Issues

No response