[v10.0.x] InfluxDB: Fix querying retention policies on flux mode (#68985)

InfluxDB: Fix querying retention policies on flux mode (#67722)

Query retention policies only on InfluxQL mode

(cherry picked from commit 373e4cab9a)

Co-authored-by: ismail simsek <ismailsimsek09@gmail.com>

public/app/plugins/datasource/influxdb/datasource.ts

@@ -169,7 +169,8 @@ export default class InfluxDatasource extends DataSourceWithBackend<InfluxQuery,
   }
 
   async getRetentionPolicies(): Promise<string[]> {
-    if (this.retentionPolicies.length) {
+    // Only For InfluxQL Mode
+    if (this.isFlux || this.retentionPolicies.length) {
       return Promise.resolve(this.retentionPolicies);
     } else {
       return getAllPolicies(this).catch((err) => {