Live: performance tests e2e part (#43915)

* #41993: live perf tests e2e part

* #41993: added bash upgrade instructions

* #41993: remove custom feature toggle

* #41993: fix typo in 'integrationFolder'

e2e/start-server

@@ -36,6 +36,7 @@ else
   mkdir $PROV_DIR/datasources
   mkdir $PROV_DIR/dashboards
 
+  cp ./e2e/custom.ini $RUNDIR/conf/custom.ini
   cp ./conf/defaults.ini $RUNDIR/conf/defaults.ini
 fi