GD-474: Fix test Godot Runtime Error is reported repeatedly (#475)

# Why
see #474

# What
Do cleanup log entries after collected as reports

addons/gdUnit4/src/monitor/GodotGdErrorMonitor.gd

@@ -28,6 +28,7 @@ func to_reports() -> Array[GdUnitReport]:
 	var reports_ :Array[GdUnitReport] = []
 	if _report_enabled:
 		reports_.assign(_entries.map(_to_report))
+	_entries.clear()
 	return reports_
 
 

addons/gdUnit4/test/monitor/GodotGdErrorMonitorTest.gd

@@ -123,3 +123,10 @@ func test_integration_test() -> void:
 		assert_str(reports[1].message()).contains("Test GodotGdErrorMonitor 'push_warning' reporting")
 	else:
 		fail("Expect reporting runtime errors")
+
+	# scan second time should not report the same errors again
+	monitor.start()
+	monitor.stop()
+	await monitor.scan(true)
+	reports = monitor.to_reports()
+	assert_array(reports).is_empty()