Add related.entity field to azure activitylogs default ingest pipeline

[orouz]

Proposed commit message

this PR is part of the cloud security CDR epic. it adds 2 append processors that add the principal_id (event/action origin) and resource_id (event/action target) to a new field - related.entity

the related.entity field is an upcoming ECS field meant to facilitate pivoting around a piece of data.

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.

Related issues

• related Add related.entity to cloudtrail integration #11115
• closes https://github.com/elastic/security-team/issues/10391

[orouz]

/test

[elasticmachine]

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