plugins_integration: record crash reports before the site is updated.

Within 'test_plugin_update',
So that during test-teardown,
the recorded crash reports occurring before the site update are ignored.

CMK-28634

Change-Id: I4844271a8bedf07073492c78146dd870de6fa8a0

Author: dhsh-checkmk

tests/plugins_integration/test_plugin_update.py

@@ -70,6 +70,9 @@ def _collect_test_site_base_data(
                     base_data[host_name].pop(skipped_check)
 
             base_data_status_ok[host_name] = get_services_with_status(base_data[host_name], 0)
+    # Record crash reports. Such crash reports are ignored during per-test validations
+    # performed in tests.conftest::pytest_runtest_teardown
+    test_site_base.known_crashes.update(test_site_base.crash_reports_dirs())
     return test_site_base, psd_rules_base, base_data, base_data_status_ok