Enhance SandboxClaimStatus for Better Observability

[shrutiyam-glitch]

What would you like to be added?

Add printer columns to kubectl get sandboxclaim output.

Why is this needed?

Currently, the SandboxClaim resource provides very limited information in its status. When you run kubectl get sandboxclaim, you only see the age of the resource:

  $ kubectl get sandboxclaim my-claim
  NAME          AGE
  my-claim      45s

This makes it difficult to monitor claim health, quickly check stuck claims without inspecting the resource describe.

Proposed Solution

Add printer columns to kubectl get sandboxclaim output.

The SandboxClaimStatus already tracks enough information to surface useful columns. The output should look like:

 $ kubectl get sandboxclaim 
 NAME        READY   SANDBOX         REASON                                     AGE
 my-claim-1    False    my-claim-xk9z        WarmpoolNotFound              3s
 my-claim-2    True    my-claim-xk9y                                      3s

Proposed Columns:

Field	Source	Description
READY	status.conditions[type=Ready].status	True or False
SANDBOX	status.sandbox.name	Name of the underlying Sandbox resource
REASON	status.conditions[type=Ready].reason	Reason for current ready state
AGE	Standard	-

The REASON column is a valuable addition — it surfaces the condition reason directly in the list view, eliminating the need to run kubectl describe to diagnose a stuck or failed claim.

[shrutiyam-glitch]

cc: @aditya-shantanu @igooch @sairajp-rewind

[sairajp-rewind]

/assign