Duplicate values for ENV vars for pods in shared mode

[galal-hussein]

Currently we modify the env vars for the pods created in shared mode, mainly the KUBERNETES_* env vars to connect the pods to the API of the virtual cluster, however it seems that we are duplicating the value and not actually replacing the old values, this is causing many warnings:

{"level":"info","timestamp":"2025-01-22T17:46:30.655Z","logger":"KubeAPIWarningLogger","msg":"spec.containers[0].env[8]: hides previous definition of \"KUBERNETES_PORT_443_TCP\", which may be dropped when using apply"}
{"level":"info","timestamp":"2025-01-22T17:46:30.655Z","logger":"KubeAPIWarningLogger","msg":"spec.containers[0].env[9]: hides previous definition of \"KUBERNETES_PORT\", which may be dropped when using apply"}
{"level":"info","timestamp":"2025-01-22T17:46:30.655Z","logger":"KubeAPIWarningLogger","msg":"spec.containers[0].env[10]: hides previous definition of \"KUBERNETES_PORT_443_TCP_ADDR\", which may be dropped when using apply"}
{"level":"info","timestamp":"2025-01-22T17:46:30.655Z","logger":"KubeAPIWarningLogger","msg":"spec.containers[0].env[11]: hides previous definition of \"KUBERNETES_SERVICE_HOST\", which may be dropped when using apply"}
{"level":"info","timestamp":"2025-01-22T17:46:30.655Z","logger":"KubeAPIWarningLogger","msg":"spec.containers[0].env[12]: hides previous definition of \"KUBERNETES_SERVICE_PORT\", which may be dropped when using apply"}

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