Improve redeploy response with per-license status details

[SayeVikram]

Summary

• Resolves the TODO in redeploy_licenses to return a more actionable response from PATCH /license/redeploy
• Each license now reports individual terminate/create outcomes, overall status, and any errors
• Adds top-level total, succeeded, and failed counters for quick health checks
• Filters out invalid license records before processing to avoid null-pointer errors

Fixes #522

Details

Previously, the endpoint returned a single generic message ({"message": "Licenses redeployed."}) regardless of whether individual licenses succeeded or failed. Callers (CLI, automation) had no way to detect partial failures without reading server logs.

Now the response includes a results array with per-license detail:
{
"message": "Licenses redeployed.",
"total": 2,
"succeeded": 1,
"failed": 1,
"results": [
{
"license_id": "L1",
"client_name": "cds",
"previous_k8s_deployment_id": "k1",
"terminate": "success",
"create": "success",
"status": "success",
"errors": []
},
{
"license_id": "L2",
"client_name": "mars",
"previous_k8s_deployment_id": "k2",
"terminate": "success",
"create": "failed",
"status": "failed",
"errors": ["create: "]
}
]
}