helm: Add tetragon.livenessProbe value

[michi-covalent]

Add tetragon.livenessProbe Helm value that overrides the default liveness probe for the tetragon container. For example, to use grpc probe, you can specify tetragon.livenessProbe Helm value like this:

tetragon:
  livenessProbe:
    grpc:
      port: 54321

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[michi-covalent]

✅ manually validated:

% cat myval.yaml
tetragon:
  livenessProbe:
    grpc:
      port: 54321

% helm template ./install/kubernetes/tetragon -f ./myval.yaml
...
      - name: tetragon
        securityContext:
          privileged: true
        image: "quay.io/cilium/tetragon:v1.1.0"
        imagePullPolicy: IfNotPresent
        terminationMessagePolicy: FallbackToLogsOnError
        args:
          - --config-dir=/etc/tetragon/tetragon.conf.d/
        volumeMounts:
          - mountPath: /etc/tetragon/tetragon.conf.d/
            name: tetragon-config
            readOnly: true
          - mountPath: /sys/fs/bpf
            mountPropagation: Bidirectional
            name: bpf-maps
          - mountPath: "/var/run/cilium"
            name: cilium-run
          - mountPath: /var/run/cilium/tetragon
            name: export-logs
          - mountPath: "/procRoot"
            name: host-proc

        env:
          - name: NODE_NAME
            valueFrom:
              fieldRef:
                  fieldPath: spec.nodeName
        livenessProbe:
          grpc:
            port: 54321
...

[kkourt]

Test failure was unrelated: #2470