[v3-1-test] Use log_level for root logger instead of hardcoded INFO level (#60784) (#60970)

* Use log_level for root logger instead of hardcoded INFO level

* Added test for debug level
(cherry picked from commit f08d414)

Co-authored-by: Justin Pakzad <114518232+justinpakzad@users.noreply.github.com>

Author: github-actions[bot]

shared/logging/src/airflow_shared/logging/structlog.py

@@ -543,7 +543,7 @@ def is_atty():
     )
     config["root"] = {
         "handlers": ["default"],
-        "level": "INFO",
+        "level": log_level.upper(),
         "propagate": True,
     }
 

shared/logging/tests/logging/test_structlog.py

@@ -367,3 +367,16 @@ def test_logger_filtering(structlog_config, levels):
         [other.logger] Hello key1=value4
         [my.logger.sub] Hello key1=value5
         """)
+
+
+def test_logger_respects_configured_level(structlog_config):
+    with structlog_config(
+        colors=False,
+        log_format="[%(name)s] %(message)s",
+        log_level="DEBUG",
+    ) as sio:
+        my_logger = logging.getLogger("my_logger")
+        my_logger.debug("Debug message")
+
+    written = sio.getvalue()
+    assert "[my_logger] Debug message\n" in written