Fix report naming

Fixes report naming, adding time to report name. Adds created_at column
for reports, so that reports can be sorted correctly.

Related-PROD: PRODX-6216
Change-Id: If45729ac9378c72d112cc4d02502cd001bbf4d81
diff --git a/testrail_bot/control/models.py b/testrail_bot/control/models.py
index 6a13c8e..fc4af58 100644
--- a/testrail_bot/control/models.py
+++ b/testrail_bot/control/models.py
@@ -21,3 +21,4 @@
     test_run = models.ForeignKey(TestRun, on_delete=models.CASCADE)
     report_name = models.CharField(max_length=300)
     finished = models.BooleanField(default=False)
+    created_at = models.DateTimeField(auto_now_add=True)