Tempo: Send the correct start time when making a TraceQL query (#59128)

(cherry picked from commit 6d94fa6)

public/app/plugins/datasource/tempo/datasource.ts

@@ -184,7 +184,7 @@ export class TempoDatasource extends DataSourceWithBackend<TempoQuery, TempoJson
           this._request('/api/search', {
             q: targets.traceql[0].query,
             limit: options.targets[0].limit,
-            start: 0, // Currently the API doesn't return traces when using the 'From' time selected in Explore
+            start: options.range.from.unix(),
             end: options.range.to.unix(),
           }).pipe(
             map((response) => {