Validation Needed to Restrict Auto and Recreate Modes for Namespace Experiments

[shekhar316]

Describe the bug

Auto and recreate modes are currently allowed for namespace experiments, which is not supported. A validation needs to be added to restrict the use of auto or recreate modes for namespace experiments.

How to reproduce it

Currently, namespace experiments mistakenly allow the selection of "auto" or "recreate" modes, even though these modes are not supported. This leads to unexpected behavior.

1. Create an experiment using a namespace JSON.
2. Set the mode to either "auto" or "recreate."

Expected behavior

If the mode is set to "auto" or "recreate," the following response should be returned:

{
  "message": "auto or recreate mode is not supported for namespace experiment.",
  "httpcode": 400,
  "documentationLink": "",
  "status": "ERROR"
}