[NDB_BVL_Instrument] Modify Examiner Select (#9452)

Add distinct clause to examiner queries so that recreate_conflicts
work when there are multiple examiners with the same name.

Author: skarya22

php/libraries/NDB_BVL_Instrument.class.inc

@@ -1028,7 +1028,7 @@ abstract class NDB_BVL_Instrument extends NDB_Page
                 ['tst_name' => $this->testName]
             );
             $results = $db->pselectWithIndexKey(
-                "SELECT c.examinerID, e.full_name, u.Email
+                "SELECT DISTINCT c.examinerID, e.full_name, u.Email
                  FROM certification c
                      JOIN examiners e
                          ON (c.examinerID = e.examinerID)
@@ -1050,7 +1050,7 @@ abstract class NDB_BVL_Instrument extends NDB_Page
             );
         } else {
             $results = $db->pselectWithIndexKey(
-                "SELECT e.examinerID, e.full_name, u.Email
+                "SELECT DISTINCT e.examinerID, e.full_name, u.Email
                      FROM examiners e
                          JOIN examiners_psc_rel epr
                              ON (epr.examinerID=e.examinerID)