Follow up to #201813

Meta issue to summarize improvements to test coverage for 9.1.0.

Jest unit tests

• [ML] Anomalies table: Enhances display for anomaly time function values #216142
• Connectors: Filter inference connectors without existing endpoints  #217641
• [Inference] Fixes some OpenAI models not accepting temperature for Inference service #218887
• [ML] Fix OpenAI connector does not use the action proxy configuration for all subactions #219617
• [Inference] Fix Azure hostname check  #222499
• [ML] Anomaly Explorer: New severity colors alignment & New UX for filtering anomalies #221081
• ES|QL pattern formatting #222871
• [ML] AI Connector creation endpoint: test for error message handler #227336

API integration tests

• DELETE /internal/ml/datafeeds/:datafeedId (JG) [ML] Delete datafeed api tests #225455
• GET /internal/ml/trained_models/ingest_pipelines (DA) [ML] Optimize the ingest_pipelines endpoint #227998
• POST /internal/ml/trained_models/create_inference_pipeline (DA) [ML] Optimize the ingest_pipelines endpoint #227998

Functional tests

• Change point detection - no results state (RJ) [ML] AIOps: Enhances No Results state for Change Point Detection #219072
• SMV: Assert that it should not show a chart until the partition field is selected (DA) [ML] Remove dependency cache. #189729 (comment)
• SMV: Assert annotations and anomalies table content. [ML] Remove dependency cache. #189729 (comment) (at the moment we only assert if exists)
• AD jobs list: Stop datafeed action [ML] Remove dependency cache. #189729 (comment)