Adjust AI tests thresholds
Adjusting thresholds for AI tests based on results https://10k.testbed.gitlab.net/-/grafana/d/J0ysCtCWz/gpt-test-results?orgId=1&var-test_name=api_v4_code_suggestions_completions&var-test_name=api_v4_code_suggestions_completions_streaming&var-test_name=api_v4_code_suggestions_generation&var-test_name=api_v4_code_suggestions_generation_streaming&var-test_name=api_v4_code_suggestions_generations