ValueFormats: Currency: Add support for Bulgarian Lev (BGN) (#77333)

* Add Bulgarian Lev in Currency

* Adding BGN to polestar.json

* Adding Bulgarian lev currency to polystat_test.json

devenv/dev-dashboards/panel-polystat/polystat_test.json

@@ -449,10 +449,14 @@
               "text": "Malaysian Ringgit (RM)",
               "value": "currencyMYR"
             },
-	    {
+	          {
               "text": "CFP franc (XPF)",
               "value": "currencyXPF"
             }
+            {
+              "text": "Bulgarian Lev (BGN)",
+              "value": "currencyBGN"
+            }
           ],
           "text": "currency"
         },
@@ -1612,6 +1616,10 @@
               "text": "Malaysian Ringgit (RM)",
               "value": "currencyMYR"
             }
+            {
+              "text": "Bulgarian Lev (BGN)",
+              "value": "currencyBGN"
+            }
           ],
           "text": "currency"
         },
@@ -2707,6 +2715,10 @@
               "text": "Malaysian Ringgit (RM)",
               "value": "currencyMYR"
             }
+            {
+              "text": "Bulgarian Lev (BGN)",
+              "value": "currencyBGN"
+            }
           ],
           "text": "currency"
         },