[8.14](backport #4707) Make elasticsearchexporter available in Agent running in OTel mode

[mergify]

What does this PR do?

This PR makes the elasticsearch exporter available to users running Elastic Agent in otel mode.

Why is it important?

To allow users of Elastic Agent running as as OpenTelemetry Collector to configure pipelines containing the elasticsearchexporter.

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/fragments using the changelog tool
• I have added an integration test or an E2E test

---

This is an automatic backport of pull request #4707 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of a045482 has failed:

On branch mergify/bp/8.14/pr-4707
Your branch is up to date with 'origin/8.14'.

You are currently cherry-picking commit a045482d51.
  (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
	new file:   changelog/fragments/1715178161-otel-mode-add-elasticsearch-exporter.yaml
	modified:   internal/pkg/otel/components.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   go.mod
	both modified:   go.sum
	both modified:   internal/pkg/otel/README.md

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

[ycombinator]

Waiting on #4714 to be merged before rebasing this PR on 8.14.

[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/8.14/pr-4707 upstream/mergify/bp/8.14/pr-4707
git merge upstream/8.14
git push upstream mergify/bp/8.14/pr-4707

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube