Docs: Logstash 8.18.0 release docs

[karenzone]

Logstash release manager: @andsel
Logstash tech writer: @karenzone
Docs release manager: @eedugon

Logstash release docs

• Day after FF, cut branches:
  • logstash
  • logstash-docs
  • ingest-docs
    • Update backport tooling for ingest-docs: Add 8.18 branch to backport and mergify configs ingest-docs#1664
    • Update backport label: backport-8.18 Color: #BFD4F2
• Release notes:
  • Add link to docs release issue: https://github.com/elastic/dev/issues/2993
  • Verify that release notes PR is forwardported to 8.x:
• Update plugin docs: updated docs for 8.18 logstash-docs#1805
  • Bump lock file: bump lock file for 8.18 #16984

[ssijbabu]

when can we expect this release?