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

• Duration: 15 min 14 sec

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• Commit: 17cafe7

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• 💔 Build #6 failed b1ed66e

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