Fleet and Agent 9.2.0 release notes

[karenzone]

Docs release manager: @nastasha-solomon
Tech Writer: @karenzone

Fleet and Agent release notes

Release note PRs:

• Elastic-agent PR: Changelog 9.2.0 elastic-agent#10710

  • Forwardport to main:

• Fleet-server PR: Changelog for 9.2.0 fleet-server#5756

  • Forwardport to main:

• Add PR links to docs release issue: https://github.com/elastic/dev/issues/3324

Forwardports 🎗️

• Verify that release notes PRs are forwardported to appropriate branches.
  Release notes are published from main, and are not live until the forwardport to main is complete. ❗