Commits on Dec 18, 2023

1. [Fleet] removed restriction to use remote es as integration data (ela… …

   …stic#173353)
   
   Closes elastic#173237
   
   Removed restriction to allow using remote es output as integration data
   output.
   
   - Create a remote es output, verify that the output is allowed to be set
   as default for agent integrations
   - Create an agent policy with system integration and set the remote es
   output as integration data output
   - Enroll an agent to the agent policy
   - Check the remote kibana - Discover, verify that system metrics are
   coming in from the agent
   - Install system package on the remote cluster to see dashboards,
   mappings, etc.
   - Add nginx integration to the agent policy
   - Create a dummy nginx log file in `/var/tmp/nginx/access.log` and add
   some dummy data to it
   - Verify that the data from the nginx log file appears in the remote
   kibana Discover in `logs-*` data view.
   - Change the agent policy integration output back to default
   - Verify that the system integration data is ingested in the main
   cluster.
   - Verify that the API key is invalidated in the remote cluster
   
   <img width="1742" alt="image"
   src="https://github.com/elastic/kibana/assets/90178898/47ed4e89-e761-4f24-90c3-bf3a49a6b4f1">
   
   <img width="937" alt="image"
   src="https://github.com/elastic/kibana/assets/90178898/2e41f37e-a4ef-4f18-aed0-d4160efe306a">
   
   <img width="2162" alt="image"
   src="https://github.com/elastic/kibana/assets/90178898/bf5d900b-f3bd-493e-b61a-4554224a97fc">
   
   <img width="2150" alt="image"
   src="https://github.com/elastic/kibana/assets/90178898/31e4f32e-8751-4b02-855f-dc7fbd5e64a9">
   
   System dashboard on remote cluster populated:
   <img width="2157" alt="image"
   src="https://github.com/elastic/kibana/assets/90178898/dfb10791-ab15-4058-9170-7cad51935493">
   
   - [x] [Unit or functional
   tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
   were updated or added to match the most common scenarios

   

   juliaElastic committed Dec 18, 2023
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2. fix merge

   

   juliaElastic committed Dec 18, 2023
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