fix: changed metric ids in cvedb to constants and fixed test (#4473)

test/test_source_epss.py

@@ -23,15 +23,12 @@ def setup_class(cls):
     ]
 
     def test_parse_epss(self):
-        # EPSS need metrics table to populated in the database. To get the EPSS metric id from table.
+        # EPSS need metrics table to populated in the database. EPSS metric id is a constant.
         cvedb = CVEDB()
         # creating table
         cvedb.init_database()
         # populating metrics
         cvedb.populate_metrics()
-        cursor = cvedb.db_open_and_get_cursor()
-        # seting EPSS_metric_id
-        self.epss.EPSS_id_finder(cursor)
         # parsing the data
         self.epss_data = self.epss.parse_epss_data(self.epss.file_name)
         cvedb.db_close()