Fix broken Kibana ML documentation links after plugin path reorganization (backport #3040)

[mergify]

Kibana 8.18+ moved the ML plugin from x-pack/plugins/ml to x-pack/platform/plugins/shared/ml, breaking all documentation links to job and datafeed definitions.

Changes

• Updated path references across 9 ML anomaly detection configuration files:

  • ootb-ml-jobs-metricbeat.asciidoc
  • ootb-ml-jobs-apache.asciidoc
  • ootb-ml-jobs-apm.asciidoc
  • ootb-ml-jobs-auditbeat.asciidoc
  • ootb-ml-jobs-logs-ui.asciidoc
  • ootb-ml-jobs-metrics-ui.asciidoc
  • ootb-ml-jobs-nginx.asciidoc
  • ootb-ml-jobs-siem.asciidoc
  • ootb-ml-jobs-uptime.asciidoc

• Standardized APM links to use {branch} variable instead of hardcoded main

-https://github.com/elastic/kibana/blob/{branch}/x-pack/plugins/ml/server/models/data_recognizer/modules/metricbeat_system_ecs/ml/high_mean_cpu_iowait_ecs.json
+https://github.com/elastic/kibana/blob/{branch}/x-pack/platform/plugins/shared/ml/server/models/data_recognizer/modules/metricbeat_system_ecs/ml/high_mean_cpu_iowait_ecs.json

Backport required: 8.18 and 8.19 branches

Original prompt

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This section details on the original issue you should resolve

<issue_title>[ML UI/AI Infra][8.18 & 8.19][Bug] Fix broken links on "Metricbeat anomaly detection configurations" page</issue_title>
<issue_description>Fix broken links on https://www.elastic.co/guide/en/machine-learning/8.19/ootb-ml-jobs-metricbeat.html and backport changes to the 8.18 and 8.19 branches. More details here. </issue_description>

<agent_instructions>Fix links that reference outdated paths in the kibana repo. Refer to the linked issue to find the page that needs updates.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes [ML UI/AI Infra][8.18 & 8.19][Bug] Fix broken links on "Metricbeat anomaly detection configurations" page #3039

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This is an automatic backport of pull request #3040 done by [Mergify](https://mergify.com).

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