InfluxDB: Move database information into jsondata (#62308)

* Use dbName in jsonData instead of database

* Use dbName in instead of database

* Remove database fields and define dbName instead

* Fix tests

* set database field as empty string

pkg/tsdb/influxdb/mocks_test.go

@@ -68,7 +68,7 @@ func (f *fakeInstance) Get(pluginContext backend.PluginContext) (instancemgmt.In
 		HTTPClient:    client,
 		Token:         "sometoken",
 		URL:           "https://awesome-influx.com",
-		Database:      "testdb",
+		DbName:        "testdb",
 		Version:       f.version,
 		HTTPMode:      "GET",
 		TimeInterval:  "10s",