[9.1](backport #45145) [beatreceivers] Introduce otel mode for metricbeat

[mergify]

Proposed commit message

This PR introduces otel mode for metricbeat. This will allow us to write e2e test for metricbeat inputs.

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

cd x-pack/metricbeat
mage buildOTel
./metricbeat otel --config metricbeat-otel.yml

Tests:

cd x-pack/metricbeat
go test -c -tags otelbeat
go test   -tags "integration" -run 'TestMetricbeatOTel.*' ./tests/integration -v -count=1

---

This is an automatic backport of pull request #45145 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of f0b0f2a has failed:

On branch mergify/bp/9.1/pr-45145
Your branch is up to date with 'origin/9.1'.

You are currently cherry-picking commit f0b0f2a91.
  (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:   dev-tools/mage/build.go
	modified:   libbeat/otelbeat/beatconverter/beatconverter.go
	modified:   libbeat/otelbeat/providers/fbprovider/fbprovider.go
	modified:   libbeat/otelbeat/providers/fbprovider/fbprovider_test.go
	new file:   libbeat/otelbeat/providers/mbprovider/mbprovider.go
	new file:   libbeat/otelbeat/providers/mbprovider/mbprovider_test.go
	new file:   libbeat/otelbeat/providers/providers.go
	modified:   libbeat/tests/integration/framework.go
	modified:   x-pack/filebeat/cmd/otelcmd_enabled.go
	modified:   x-pack/filebeat/magefile.go
	new file:   x-pack/metricbeat/cmd/otelcmd_disabled.go
	new file:   x-pack/metricbeat/cmd/otelcmd_enabled.go
	modified:   x-pack/metricbeat/cmd/root.go
	modified:   x-pack/metricbeat/docker-compose.yml
	modified:   x-pack/metricbeat/magefile.go
	new file:   x-pack/metricbeat/metricbeat-otel.yml
	new file:   x-pack/metricbeat/tests/integration/otel_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x-pack/libbeat/common/otelbeat/otel.go

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

[github-actions]

🤖 GitHub comments

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Just comment with:

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

[elasticmachine]

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

[pierrehilbert]

@khushijain21 could you please fix the conflicts?

[mauri870]

@khushijain21 I'm not sure how this managed to pass CI checks, this function is not present on 9.1 :/

[khushijain21]

that is very strange because the build did fail the stage did not

link

[khushijain21]

oh now I know - the mage command does not check if the main integ test failed or not. I will update the code. Thanks @mauri870