[Fleet] Add permissions to kibana_system to write logs-elastic_agent.status_change-* data stream

[juliaElastic]

Closes https://github.com/elastic/ingest-dev/issues/5634

Add permissions to kibana_system to write logs-elastic_agent.status_change-* data stream.
Required for a new feature to write Agent status to a new data stream for alerting.

• Have you signed the contributor license agreement? yes
• Have you followed the contributor guidelines? yes
• If submitting code, have you built your formula locally prior to submission with gradle check? yes
• If submitting code, is your pull request against main? Unless there is a good reason otherwise, we prefer pull requests against main and will backport as needed. yes
• If submitting code, have you checked that your submission is for an OS and architecture that we support? yes
• If you are submitting this code for a class then read our policy for that.

[elasticsearchmachine]

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

[azasypkin]

questions:

1. Is the functionality that relies on this permission available in all our offerings (on-prem, ECH, Serverless)?
2. Are you planning to backport this change to 8.x?
3. The linked issue says that user needs permissions to **write**, do we really need all here or we can just use write?

[juliaElastic]

1. Yes
2. No, this feature is planned for 9.2
3. We need all to include creating/deleting/managing the data stream too.

[azasypkin]

LGTM, thanks for answering clarifying questions and updating the kibana_system privileges spreadsheet.