[AWS CloudTrail] Remove host.id assignment from target entities

[alexreal1314]

Closes #19628

Proposed commit message

Remove set host.id from the CloudTrail target entities via hostTargets.first(). This is incorrect: host.id identifies the actor
host that originated the event, not a resource the event acted upon.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

How to test this PR locally

cd packages/aws
elastic-package build
elastic-package install
elastic-package test pipeline -v --data-streams cloudtrail --generate

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Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

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