Increase lifespan of test-times files

- build_environment is hard coded to value from upstream when
  branch for created, since the dev/QA ENV build_environment
  value can be varing

(cherry picked from commit d4fbf03)

Author: pruthvistony

tools/stats/import_test_stats.py

@@ -32,7 +32,8 @@ def get_disabled_issues() -> list[str]:
 TD_HEURISTIC_PREVIOUSLY_FAILED = "previous_failures.json"
 TD_HEURISTIC_PREVIOUSLY_FAILED_ADDITIONAL = "previous_failures_additional.json"
 
-FILE_CACHE_LIFESPAN_SECONDS = datetime.timedelta(hours=3).seconds
+#increse the cache time to 6 months
+FILE_CACHE_LIFESPAN_SECONDS = 6 * 30 * 24 * 3600
 
 
 def fetch_and_cache(