[ML] Increase Test Coverage 8.14.0

[peteharverson]

Follow up to #173301

Meta issue to summarize improvements to test coverage for 8.14.0.

Jest unit tests

• @kbn/ml-query-utils (WR) [ML] AIOps: Improve cleanup of default queries. #176534
• [ML] AIOps: Fix text field candidate selection for log rate analysis. #179699 (WR)

API integration tests

• POST /internal/ml/jobs/bulk_create (JG) [ML] Adding bulk create API tests #182171
• GET /internal/ml/jobs/all_jobs_and_group_ids (JG) [ML] Adding API test for all_jobs_and_group_ids #182148

Serverless tests

• Exclude frozen data tier control does not appear (ML and transforms) (QN) [ML] Adds serverless functional test for Frozen data tier control and ES|QL data visualizer links #181193
• ES|QL data visualizer links (QN) [ML] Adds serverless functional test for Frozen data tier control and ES|QL data visualizer links #181193

Functional tests

• Single metric viewer embeddable in Dashboard (MA) [ML] Single metric viewer in dashboards: adds functional test #178768
• Trained models list permission tests (TS) [ML] Add trained model list permission UI tests #174045
• Calendars / job groups (TS) [ML] Add more ML calendar UI tests #178553

Performance testing journey

• Log rate analysis (WR) [ML] AIOps: Add performance journey for log rate analysis. #178017, follow up: [ML] AIOps: Stabilize performance journey for log rate analysis. #180468

Accessibility tests

part of #88496

• [ML] Unskip a11y tests and fix datavisualizer test #179833 (PH)

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[peteharverson]

Closing as all items planned for 8.14.0 have been completed.