add filebeat integration test for shipper input/output

[leehinman]

Proposed commit message

Add filebeat shipper input/output integration test

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
  - [ ] I have made corresponding changes to the documentation
  - [ ] I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
  - [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

Run go integration tests

cd x-pack/filebeat
mage goUnitTest

Just run this test

cd x-pack/filebeat
mage docker:composeUp
go test ./tests/integration -count 1 -tags integration -run TestShipperInputOutput

Related issues

• Relates Add document equivalency test case to end to end tests elastic-agent-shipper#290

[elasticmachine]

Pinging @elastic/elastic-agent (Team:Elastic-Agent)

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @leehinman? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2023-09-05T14:18:58.749+0000

• Duration: 56 min 23 sec

Test stats 🧪

Test	Results
Failed	0
Passed	27431
Skipped	1937
Total	29368

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• Start Time: 2023-09-06T21:05:33.464+0000

• Duration: 90 min 3 sec

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Failed	0
Passed	28225
Skipped	2015
Total	30240

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🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.

• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[xudengping]

what's shipper input

[cmacknz]

See #35135 for context on what this was. The plan has changed here however and we won't be using this input.