src/scheduler: fix field name for storing k8s context name

Correct field name for storing k8s cluster name to
`Node.data`. Set `data.job_context` field to align with
model definition.

Fixes: d916ba8 ("src/scheduler: store k8s context in the job node")
Signed-off-by: Jeny Sadadia <jeny.sadadia@collabora.com>

src/scheduler.py

@@ -124,7 +124,7 @@ def _run_job(self, job_config, runtime, platform, input_node):
 
         if platform.name == "kubernetes":
             context = runtime.get_context()
-            node['data']['k8s_context'] = context
+            node['data']['job_context'] = context
 
         try:
             self._api.node.update(node)