[DBMON-6001] Revert full_statement_text_samples_per_hour_per_query back to 1 (#22113)

* Revert full_statement_text_samples_per_hour_per_query back to 1

* Add changelog

Author: eric-weaver

postgres/assets/configuration/spec.yaml

@@ -565,7 +565,7 @@ files:
             Set the max number of full statement text samples to collect per hour per query.
           value:
             type: number
-            default: 10000
+            default: 1
         - name: incremental_query_metrics
           hidden: true
           description: |

postgres/changelog.d/22113.fixed

@@ -0,0 +1 @@
+Fixes a regression introduced in ([#21347](https://github.com/DataDog/integrations-core/pull/21347)) that caused us to cache recently seen FQT events for 0.36 seconds instead of 3600 seconds

postgres/datadog_checks/postgres/config_models/dict_defaults.py

@@ -33,7 +33,7 @@ def instance_query_metrics():
         incremental_query_metrics=False,
         baseline_metrics_expiry=300,
         full_statement_text_cache_max_size=10000,
-        full_statement_text_samples_per_hour_per_query=10000,
+        full_statement_text_samples_per_hour_per_query=1,
         run_sync=False,
     )