api: Add service_account field for k8s Pod

[sayboras]

Description

IMO, we don't need to have flag to enable service account details, feel free to let me know otherwise.

Fixes: #3118

Changelog

api: Add service_account field for k8s Pod

---

Testing

Testing was done local with kind related target, please find below the sample event

{
  "process_exec": {
    "process": {
      "exec_id": "dGV0cmFnb24tZGV2LWNvbnRyb2wtcGxhbmU6OTI2MTE1NTUxMTQ4MDo1NDAyNjQ=",
      "pid": 540264,
      "uid": 0,
      "cwd": "/",
      "binary": "/usr/bin/tetragon-operator",
      "arguments": "serve --config-dir=/etc/tetragon/operator.conf.d/ --metrics-bind-address=:2113",
      "flags": "execve rootcwd clone inInitTree",
      "start_time": "2025-07-30T06:43:33.472558105Z",
      "auid": 4294967295,
      "pod": {
        "namespace": "tetragon",
        "name": "tetragon-operator-8456c84fc-bh49w",
        "container": {
          "id": "containerd://c5113ead176ee06aae9352d11c3a745d26011c4c0ca73976cc3f7b324535b853",
          "name": "tetragon-operator",
          "image": {
            "id": "sha256:149a95b0d10ae5c2d36777867d9eb5642d139ed733f73752e1c9dd12e69eefc6",
            "name": "docker.io/cilium/tetragon-operator:latest"
          },
          "start_time": "2025-07-30T06:43:33Z",
          "pid": 1,
          "security_context": {}
        },
        "pod_labels": {
          "app.kubernetes.io/component": "operator",
          "app.kubernetes.io/instance": "tetragon",
          "app.kubernetes.io/managed-by": "Helm",
          "app.kubernetes.io/name": "tetragon-operator",
          "app.kubernetes.io/part-of": "tetragon",
          "app.kubernetes.io/version": "1.4.0",
          "helm.sh/chart": "tetragon-1.4.0",
          "pod-template-hash": "8456c84fc"
        },
        "workload": "tetragon-operator",
        "workload_kind": "Deployment",
        "service_account": "tetragon-operator-service-account"
      },
      "docker": "c5113ead176ee06aae9352d11c3a745",
      "parent_exec_id": "dGV0cmFnb24tZGV2LWNvbnRyb2wtcGxhbmU6OTI2MDk1OTkwMzM5NTo1NDAyMTQ=",
      "tid": 540264,
      "in_init_tree": true
    },
    "parent": {
      "exec_id": "dGV0cmFnb24tZGV2LWNvbnRyb2wtcGxhbmU6OTI2MDk1OTkwMzM5NTo1NDAyMTQ=",
      "pid": 540214,
      "uid": 0,
      "cwd": "/run/containerd/io.containerd.runtime.v2.task/k8s.io/9addb6df7115d9c3f664a440abad69077d6df2cb1f4c31d005d66c5a68bb70b2",
      "binary": "/usr/local/bin/containerd-shim-runc-v2",
      "arguments": "-namespace k8s.io -id 9addb6df7115d9c3f664a440abad69077d6df2cb1f4c31d005d66c5a68bb70b2 -address /run/containerd/containerd.sock",
      "flags": "execve clone",
      "start_time": "2025-07-30T06:43:33.276949937Z",
      "auid": 4294967295,
      "parent_exec_id": "dGV0cmFnb24tZGV2LWNvbnRyb2wtcGxhbmU6OTI2MDk1NjQ2ODkyNzo1NDAyMDY=",
      "tid": 540214,
      "in_init_tree": false
    }
  },
  "node_name": "tetragon-dev-control-plane",
  "time": "2025-07-30T06:43:33.472557605Z",
  "node_labels": {
    "beta.kubernetes.io/arch": "arm64",
    "beta.kubernetes.io/os": "linux",
    "kubernetes.io/arch": "arm64",
    "kubernetes.io/hostname": "tetragon-dev-control-plane",
    "kubernetes.io/os": "linux",
    "node-role.kubernetes.io/control-plane": ""
  }
}

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