[sqlserver] Fix database_autodiscovery_interval config option being ignored (DataDog#22912)

The check was reading `autodiscovery_interval` from the instance config,
but the documented (and customer-used) key is `database_autodiscovery_interval`.
This mismatch has existed since the feature was introduced in 2020 (PR DataDog#8115),
meaning customers setting this option were silently getting the default 3600s.

Data shows 124 orgs / 3,320 hosts actively set `database_autodiscovery_interval`
in their configs. Fix the code to read the correct key.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pierreln-dd

sqlserver/changelog.d/22912.fixed

@@ -0,0 +1 @@
+Fix ``database_autodiscovery_interval`` config option being silently ignored. The check was reading ``autodiscovery_interval`` instead of the documented ``database_autodiscovery_interval`` key, so customers setting this option were always getting the default 3600s interval.

sqlserver/datadog_checks/sqlserver/config.py

@@ -32,7 +32,9 @@ def __init__(self, init_config, instance, log):
         self.autodiscovery_exclude: list[str] = instance.get('autodiscovery_exclude', ['model']) or ['model']
         self.autodiscovery_db_service_check: bool = is_affirmative(instance.get('autodiscovery_db_service_check', True))
         self.min_collection_interval: int = instance.get('min_collection_interval', 15)
-        self.autodiscovery_interval: int = instance.get('autodiscovery_interval', DEFAULT_AUTODISCOVERY_INTERVAL)
+        self.autodiscovery_interval: int = instance.get(
+            'database_autodiscovery_interval', DEFAULT_AUTODISCOVERY_INTERVAL
+        )
         self.database_instance_collection_interval: int = instance.get(
             'database_instance_collection_interval', DEFAULT_LONG_METRICS_COLLECTION_INTERVAL
         )