Add otel e2e test for httpjson input

[khushijain21]

Proposed commit message

This PR adds e2e test for httpjson input in filebeat and filebeat-otel mode and compares the documents ingested by both processes.

Checklist

• [x] My code follows the style guidelines of this project
• [x] 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
• [x] 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

cd x-pack/filebeat
go test -c -tags otelbeat
go test -tags integration -run TestHTTPJSONInputOTel ./tests/integration -v

Related issues

• Part of https://github.com/elastic/ingest-dev/issues/4889

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[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @khushijain21? 🙏. 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-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)