http_endpoint: fix handling of include header config

[efd6]

What does this PR do?

Previously the value was being rendered directly without iteration, so we had a comma-separated list instead of a YAML sequence.

Also fix some copy-paste errors.

Computed config now:

- data_stream: namespace: default id: http_endpoint-http_endpoint-c69b6080-0996-11ee-9698-67a83ee16ff8 meta: package: name: http_endpoint version: 1.9.1 name: http_endpoint-1 package_policy_id: c69b6080-0996-11ee-9698-67a83ee16ff8 policy: revision: 7 revision: 1 streams: - data_stream: dataset: http_endpoint.generic id: http_endpoint-http_endpoint.generic-c69b6080-0996-11ee-9698-67a83ee16ff8 include_headers: - user-agent - x-real-ip listen_address: localhost listen_port: 8080 publisher_pipeline.disable_host: true ssl: certificate: /etc/pki/client/cert.pem enabled: false key: /etc/pki/client/cert.key tags: - forwarded type: http_endpoint 

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Fixes Elastic Agent http_endpoint integration does not allow multiple include headers #6523

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• Start Time: 2023-06-13T03:09:04.837+0000

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• 💔 Build #6 failed b1ed66e4921627043af3c8f3a306260f654a3080

cc @efd6

[kcreddy]

LGTM 👍🏼

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Package http_endpoint - 1.9.1 containing this change is available at https://epr.elastic.co/search?package=http_endpoint