[Fleet] using all privileges

[juliaElastic]

Follow up after #100684

The issue with the FTR tests hasn't resolved, because I left out delete_index privilege. I decided to use all to make sure nothing else is missing.

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[elasticsearchmachine]

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

[kc13greiner]

LGTM; metrics-*-* are part of Fleet's data indexes for which kibana_system should be allowed elevated privileges and this pattern is appropriately listed in the docs as a potential collision pattern.