[AO] Set Feature flag of the Log threshold alert detail page to ON by default

[fkanout]

Summary

it fixes #159945

Release note:

Introducing the Logs threshold alert detail page, which provides more information and context about the Logs threshold alert

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[elasticmachine]

Pinging @elastic/actionable-observability (Team: Actionable Observability)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: ba54f55

Metrics [docs]

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	13	15	+2
securitySolution	411	415	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	494	498	+4
total			+6

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @fkanout