[8.19] (backport #10141) [otel] - Add Diagnostics Extension

[mergify]

What does this PR do?

Split from #10052

This PR add a new elasticdiagnsotics extension. This new extension will be used in hybrid mode and will perform diagnostics for running otel collector. It will:

• Acts as a registrar and keeps track of common diagnostic hooks.
• Collects profiles using runtime/pprof.
• Collects internal telemetry exposed by the OTeL Collector.
• Implements the extensioncapabilities.ConfigWatcher interface and stores the latest configuration of the running collector.
• Listens for diagnostic requests and provides diagnostic data.

Checklist

• I have read and understood the pull request guidelines of this project.
• 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

How to test this PR locally

See #10052

Related issues

• Relates [beat_receiver] manager interface beats#44604

---

This is an automatic backport of pull request #10141 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of cac88a4 has failed:

On branch mergify/bp/8.19/pr-10141
Your branch is up to date with 'origin/8.19'.

You are currently cherry-picking commit cac88a467.
  (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:
	new file:   internal/pkg/otel/extension/elasticdiagnostics/README.md
	new file:   internal/pkg/otel/extension/elasticdiagnostics/config.go
	new file:   internal/pkg/otel/extension/elasticdiagnostics/extension.go
	new file:   internal/pkg/otel/extension/elasticdiagnostics/extension_test.go
	new file:   internal/pkg/otel/extension/elasticdiagnostics/factory.go
	new file:   internal/pkg/otel/extension/elasticdiagnostics/generated_component_test.go
	new file:   internal/pkg/otel/extension/elasticdiagnostics/internal/metadata/generated_status.go
	new file:   internal/pkg/otel/extension/elasticdiagnostics/metadata.yaml
	new file:   internal/pkg/otel/extension/elasticdiagnostics/response.go
	modified:   pkg/control/v2/client/dial.go
	modified:   pkg/control/v2/client/dial_windows.go

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

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 2650c6e

Failed CI Steps

• Unit tests - Ubuntu 22.04 ARM64
• Unit tests - Windows 11
• Win2025:sudo:default

History

• 💔 Build #28763 failed 274b552

cc @VihasMakwana