[Backport 7.x] Always attach system user to internal actions #43902
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All valid licenses permit security, and the only license state where we don't support security is when there is a missing license. However, for safety we should attach the system (or xpack/security) user to internally originated actions even if the license is missing (or, more strictly, doesn't support security). This allows all nodes to communicate and send internal actions (shard state, handshake/pings, etc) even if a license is transitioning between a broken state and a valid state. Relates: elastic#42215 Backport of: elastic#43468
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All valid licenses permit security, and the only license state where
we don't support security is when there is a missing license.
However, for safety we should attach the system (or xpack/security)
user to internally originated actions even if the license is missing
(or, more strictly, doesn't support security).
This allows all nodes to communicate and send internal actions (shard
state, handshake/pings, etc) even if a license is transitioning
between a broken state and a valid state.
Backport of: #43468