fix: don't close old findings when reimport auto-creates a new test

When auto_create_context=True and the test doesn't exist yet, the reimport
falls back to DefaultImporter. With close_old_findings=True, this would
incorrectly close findings from other tests in the same engagement/product
scope because the newly created test has no prior findings to compare against.

Suppress close_old_findings for this initial-import path. Fixes #14363.

Author: valentijnscholten

dojo/api_v2/serializers.py

@@ -2711,8 +2711,11 @@ def process_scan(
                 # Attempt to create an engagement
                 logger.debug("reimport for non-existing test, using import to create new test")
                 context["engagement"] = auto_create_manager.get_or_create_engagement(**context)
+                # Do not close old findings when creating a brand new test: there are no
+                # existing findings to compare against, and close_old_findings would
+                # incorrectly close findings from other tests in the same scope.
                 context["test"], _, _, _, _, _, _ = self.get_importer(
-                    **context,
+                    **{**context, "close_old_findings": False},
                 ).process_scan(
                     context.pop("scan", None),
                 )