[8.x](backport #42886) [feat][fbreceiver] - enable http internal monitoring

[mergify]

Proposed commit message

This PR enables internal monitoring for filebeat-receiver. This is needed to expose following details:

• build information, commit id, version etc.
• information about file's being harvested, processors etc.
• runtime information such cpu, memory, gc etc

Screenshots

Screenshots before the changes for filebeat normal mode:

Screenshots after the changes for filebeat normal mode:

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.

Closes https://github.com/elastic/ingest-dev/issues/5136

---

This is an automatic backport of pull request #42886 done by Mergify.

[mergify]

Cherry-pick of da4c930 has failed:

On branch mergify/bp/8.x/pr-42886
Your branch is up to date with 'origin/8.x'.

You are currently cherry-picking commit da4c93034.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   NOTICE.txt
	modified:   libbeat/api/routes.go
	modified:   libbeat/beat/info.go
	modified:   libbeat/cmd/instance/beat.go
	modified:   x-pack/filebeat/fbreceiver/factory.go
	modified:   x-pack/filebeat/fbreceiver/receiver.go
	modified:   x-pack/filebeat/tests/integration/otel_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[elasticmachine]

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

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/8.x/pr-42886 upstream/mergify/bp/8.x/pr-42886
git merge upstream/8.x
git push upstream mergify/bp/8.x/pr-42886

[mergify]

This pull request has not been merged yet. Could you please review and merge it @VihasMakwana? 🙏