SIENTIAPDE-1478

Enhance API class to format timestamps correctly and improve logging. Update test cases to include 'end_time' parameter for better data retrieval flexibility.

tests/activities/test_api.py

@@ -139,6 +139,7 @@ async def test_get_tag_values_success(api_activity):
             'tag3': {'webid': 'webid3', 'aggr_function': 'avg', 'data_range': [0, 100]},
         },
         start_time='*-1d',
+        end_time='*',
         max_count=10,
         metadata=metadata['metadata'],
         request_timeout=30,
@@ -193,6 +194,7 @@ async def test_get_tag_values_with_default_max_count(api_activity):
         endpoint='/streamsets/recorded',
         web_ids={'tag1': {'webid': 'webid1', 'aggr_function': 'avg', 'data_range': [0, 100]}},
         start_time='*-1h',
+        end_time='*',
         max_count=1,
         metadata=metadata['metadata'],
         request_timeout=15,