fix: add parserSelector to clusterFluentBitConfig chart templates

[JoeDerby]

What this PR does / why we need it:

Add parserSelector for helm chart ClusterFluentBitConfig templates, allowing this config to use custom Parser resources

e.g.

{{- if .Values.Kubernetes -}}
{{- if .Values.fluentbit.enable -}}
apiVersion: fluentbit.fluent.io/v1alpha2
kind: ClusterFluentBitConfig
metadata:
  name: fluent-bit-config
  labels:
    app.kubernetes.io/name: fluent-bit
spec:
  service:
    parsersFile: parsers.conf
    httpServer: true
{{- if .Values.fluentbit.service.storage }}
    storage:
{{ toYaml .Values.fluentbit.service.storage | indent 6 }}
{{- end }}
  inputSelector:
    matchLabels:
      fluentbit.fluent.io/enabled: "true"
  filterSelector:
    matchLabels:
      fluentbit.fluent.io/enabled: "true"
  outputSelector:
    matchLabels:
      fluentbit.fluent.io/enabled: "true"
{{- end }}
{{- end }}

Which issue(s) this PR fixes:

Fixes #955

Does this PR introduced a user-facing change?

None

Additional documentation, usage docs, etc.:

[benjaminhuo]

@JoeDerby Thank you