NOT FOR REVIEW: Make additional OTel Collector components available in Agent running in OTel mode

[ycombinator]

What does this PR do?

This PR makes the following additional OpenTelemetry Collector components available when Elastic Agent is running in otel mode:

• elasticsearch exporter
• filter processor
• hostmetrics receiver

Why is it important?

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

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

[mergify]

This pull request does not have a backport label. Could you fix it @ycombinator? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v./d./d./d is the label to automatically backport to the 8./d branch. /d is the digit

NOTE: backport-skip has been added to this pull request.

[ycombinator]

Closing in favor of the real PR: #4623

[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