[8.12] [OAS] Add details for running Slack connector actions (#169712)

[lcawl]

Backport

This will backport the following commits from main to 8.12:

• [OAS] Add details for running Slack connector actions (#169712)

Questions ?

Please refer to the Backport tool documentation

[github-actions]

Documentation preview:

• ✨ Changed pages

[apmmachine]

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[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: d3b5f39

Failed CI Steps

• FTR Configs #45

Metrics [docs]

✅ unchanged

History

• 💛 Build #193485 was flaky 2bb3087

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