[filebeat] Add support for pprof in otel

[khushijain21]

Proposed commit message

Add support for pprof based on http.pprof.enabled config paramater in filebeat

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

Add http.pprof.enabled param to x-pack/filbeat/filebeat-otel.yml and start

./filebeat otel

OTel Collector starts pprof extension.

Related issues

Preq for #4754

Use cases

This is required for benchbuilder to collect pprof data for filebeat in otel mode

[mergify]

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

[mergify]

backport-8.x has been added to help with the transition to the new branch 8.x.
If you don't need it please use backport-skip label and remove the backport-8.x label.

[elasticmachine]

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