Add South African Rand (ZAR) to currencies (#18893)

This change adds formal support for the South African Rand in the list of currencies.

packages/grafana-ui/src/utils/valueFormats/categories.ts

@@ -112,6 +112,7 @@ export const getCategories = (): ValueFormatCategory[] => [
       { name: 'Swiss franc (CHF)', id: 'currencyCHF', fn: currency('CHF') },
       { name: 'Polish Złoty (PLN)', id: 'currencyPLN', fn: currency('PLN') },
       { name: 'Bitcoin (฿)', id: 'currencyBTC', fn: currency('฿') },
+      { name: 'South African Rand (R)', id: 'currencyZAR', fn: currency('R') },
     ],
   },
   {