[main] (backport #15078) Add Elastic Agent 8.19.17 release notes

[mergify]

Adds Elastic Agent 8.19.17 release notes.

Checklist

• @pierrehilbert review this PR to make sure the correct items are included
• @elastic/ingest-docs review the language
• @elastic/ingest-docs open a PR in the ingest-docs repo combining the Elastic Agent and Fleet Server release notes targeting the 8.19 branch
  • Doc: Add Fleet and Agent release notes for 8.19.17 ingest-docs#1913
• @pierrehilbert merge or close on release day. No forward or backports are needed.

• Note: Release notes for 8.x versions are published from the ingest-docs repo. Merging this PR won't hurt, but it is unnecessary.

• @elastic/ingest-docs merge PR in the ingest-docs repo. No forward or backports are needed.

  ---

  This is an automatic backport of pull request Add Elastic Agent 8.19.17 release notes #15078 done by Mergify.

[mergify]

Cherry-pick of 6ada13c has failed:

On branch mergify/bp/main/pr-15078
Your branch is up to date with 'origin/main'.

You are currently cherry-picking commit 6ada13ce6.
  (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:   changelog/8.19.17.asciidoc
	new file:   changelog/8.19.17.yaml
	deleted:    changelog/fragments/1777551882-drosiek-marker-stale.yaml
	deleted:    changelog/fragments/1779393592-change-bulk_response_filter_path-in-elasticsearch-exporter-configurations.yaml
	deleted:    changelog/fragments/1779748227-Add-Azure-auth-extension-to-EDOT-Collector.yaml
	deleted:    changelog/fragments/1779979535-move-fleet-uninstall-notification-before-installation-directory-removal.yaml
	deleted:    changelog/fragments/1779995943-read-container-tls-from-env.yaml
	deleted:    changelog/fragments/1779996772-fix-container-override-inconsistencies.yaml
	deleted:    changelog/fragments/1780926122-fix-bug-where-an-empty-request-body-could-be-sent-after-failing-over-to-an-alternate-fleet-host..yaml
	deleted:    changelog/fragments/1781639318-heartbeat-bump-npm-11.17.0.yaml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by them: changelog/fragments/1775843467-ensure-process-runtime-stops-before-otel-runtime-starts.yaml
	deleted by them: changelog/fragments/1776080404-update-otel-components-to-v0.149.0.yaml
	deleted by them: changelog/fragments/1778271360-Include-fleet-server-in-windows-arm64-packages.yaml
	deleted by them: changelog/fragments/1778595299-update-otel-components-to-v0.151.0.yaml
	deleted by them: changelog/fragments/1780060974-remove-synthetics-dependencies.yaml

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