[AGENT-4705] Implement Airflow Operator for adding training data to Custom model Test

[oleksandr-saienko]

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Summary

Added operator to create Custom model Test: CustomModelTestOperator Added operator to get Custom model Test status GetCustomModelTestOverallStatusOperator added sample DAG for custom model pipeline

Rationale

users should be able to create and execute Custom Model Tests using Airflow operators

[oleksandr-saienko]

Jenkins run

[oleksandr-saienko]

Jenkins run

[oleksandr-saienko]

Jenkins run