Improve validation for K8s Secret required by Kong JWT Plugin

[programmer04]

Is there an existing issue for this?

• I have searched the existing issues

Problem Statement

Currently, it is required to specify all fields whether are required or not. When a field is not required user has to fill it with a dummy value. It's not the best user experience.

See docs

• JWT plugin (the above screen is from this page)
• KIC Access Control List plugin
  • updated with PR fix: mention required secret field for JWT plugin in KIC how to docs.konghq.com#6502

Proposed Solution

Do not require filling with dummy values just to pass validation. Validate what fields are required based on the algorithm that is used.

Additional information

It was reported by a user in the discussion

• https://github.com/Kong/kubernetes-ingress-controller/discussions/5146a

Acceptance Criteria

• As a user I don't need to fill fields with dummy values to pass validation
• All aforementioned docs that mention this requirement are updated