Remove docs and unit tests surrounding running agent as non-root

[naemono]

Since v8.16 Elastic Agent doesn't need the daemonset to adjust directory permissions when running as non-root. This removes/adjusts the documentation to make this more clear. It also removes the e2e test.

Testing

• Applied fleet-kubernetes-integration.yaml in the default namespace and everything came up without issues (see screenshot)
• Verified volume uses hostPath:

      volumes:
      - hostPath:
          path: /var/lib/elastic-agent/default/elastic-agent/state
          type: DirectoryOrCreate
        name: agent-data

This will be paired with a documentation PR as well, fyi.

[prodsecmachine]

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[Copilot]

Pull request overview

This pull request removes obsolete documentation and testing infrastructure for running Elastic Agent as non-root, as this functionality is now natively supported in Elastic Agent v8.16.0 and later without requiring special DaemonSet configuration.

Key Changes:

• Removed the dedicated non-root recipe file and its associated end-to-end test
• Simplified test helper code by removing non-root specific DaemonSet mutation logic
• Updated main recipe file to document that runAsUser: 0 is no longer required since v8.16.0

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/e2e/test/helper/yaml.go	Removed maybeMutateForAgentNonRootTests function and fleet outputs configuration logic that was only needed for non-root testing; simplified DaemonSet handling
test/e2e/agent/recipes_test.go	Removed TestFleetKubernetesNonRootIntegrationRecipe test function that validated the non-root configuration
config/recipes/elastic-agent/fleet-kubernetes-integration.yaml	Added explanatory comments indicating that runAsUser: 0 is no longer needed since v8.16.0
config/recipes/elastic-agent/fleet-kubernetes-integration-nonroot.yaml	Deleted entire recipe file that demonstrated non-root setup with DaemonSet for permission management
config/recipes/elastic-agent/README.asciidoc	Removed documentation section about the non-root integration recipe

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