[Fleet] add index privileges to support reroute processor

[juliaElastic]

Closes elastic/kibana#224200

Add additional index privileges to fleet-server service account to enable reroute processor to work on these index patterns (logs, logs.*)

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[elasticsearchmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[jsoriano]

Seeing that we also have metrics-* and traces-* here, should we also add metrics, metrics.*, traces and traces.*?

[juliaElastic]

It seems we only need for logs for now: elastic/kibana#224200 (comment)

[jsoriano]

If we keep using the reroute processor I guess it is a matter of time to use it with metrics too. But ok, we can add it when this happens.